• archaeology
    Not all archaeologists are as swashbuckling as Indiana Jones and Lara Croft. Some, but not all.

    Photograph by Richard Hewitt Stewart

    The ABCs of Dating
    Sometimes dates are listed as BC or AD. Other times they show up as BCE or CE. What is the difference?

    BC stands for Before Christ, and it is used to date events that happened before the birth of Jesus, whom Christians consider the son of God. AD refers to Anno Domini, Latin for year of our Lord, and refers to all the years from Jesus birth onward. In the late 20th century, scientists realized they were basing the entire history of the world around the birth of one religious figure.

    Many archeologists now prefer the terms BCE (Before Common Era) and CE (Common Era). The dates are still the same, only the letters have changed.

    Ancient Cannibals
    Some ancient humans may have indulged in cannibalism on a regular basis. Archaeologists discovered 800,000-year-old remains from an early human species, Homo antecessor, in a Spanish cave. Among the remains were human bones with marks on them that appear to come from stone tools used to prepare meals.

    Trashy Science
    Most archaeologists study the past, but some study people who are still alive. For example, Dr. William Rathje uses his archaeological skills to dig through present-day garbage bins and landfills to learn about what Americans consume, discard, and waste.

    Sherds and Shards
    Many archaeologists study broken bits of pottery. These fragments are called potsherds, and sometimes just sherds. Sherds can be anything from bits of a broken water jug to a piece of a clay tablet to the components of China's "Terra Cotta Warriors."

    Shards are broken bits of glass, which are also important to archaeology. Shards include fragments of ancient windows, wine bottles, and jewelry.

    Archaeology is the study of the human past using material remains. These remains can be any objects that people created, modified, or used.

    Portable remains are usually called artifacts. Artifacts include tools, clothing, and decorations. Non-portable remains, such as pyramids or post-holes, are called features.

    Archaeologists use artifacts and features to learn how people lived in specific times and places. They want to know what these people’s daily lives were like, how they were governed, how they interacted with each other, and what they believed and valued.

    Sometimes, artifacts and features provide the only clues about an ancient community or civilization. Prehistoric civilizations did not leave behind written records, so we cannot read about them.

    Understanding why ancient cultures built the giant stone circles at Stonehenge, England, for instance, remains a challenge 5,000 years after the first monoliths were erected. Archaeologists studying Stonehenge do not have ancient manuscripts to tell them how cultures used the feature. They rely on the enormous stones themselves—how they are arranged and the way the site developed over time.

    Most cultures with writing systems leave written records that archaeologists consult and study. Some of the most valuable written records are everyday items, such as shopping lists and tax forms. Latin, the language of ancient Rome, helps archaeologists understand artifacts and features discovered in parts of the Roman Empire. The use of Latin shows how far the empire’s influence extended, and the records themselves can tell archaeologists what foods were available in an area, how much they cost, and what buildings belonged to families or businesses.

    Many ancient civilizations had complex writing systems that archaeologists and linguists are still working to decipher. The written system of the Mayan language, for instance, remained a mystery to scholars until the 20th century. The Maya were one of the most powerful pre-Columbian civilizations in North America, and their Central American temples and manuscripts are inscribed with a collection of squared glyphs, or symbols. A series of circles and lines represents numbers.

    By deciphering the Mayan script, archaeologists were able to trace the ancestry of Mayan kings and chart the development of their calendar and agricultural seasons. Understanding the basics of the Mayan writing system helps archaeologists discover how Mayan culture functioned—how they were governed, how they traded with some neighbors and went to war with others, what they ate, and what gods they worshipped.

    As archaeologists become more fluent in Mayan writing, they are making new discoveries about the culture every day. Today, some archaeologists work with linguists and poets to preserve the once-lost Mayan language.

    History of Archaeology

    The word “archaeology” comes from the Greek word “arkhaios,” which means “ancient.” Although some archaeologists study living cultures, most archaeologists concern themselves with the distant past.

    People have dug up monuments and collected artifacts for thousands of years. Often, these people were not scholars, but looters and grave robbers looking to make money or build up their personal collections.

    For instance, grave robbers have been plundering the magnificent tombs of Egypt since the time the Pyramids were built. Grave robbing was such a common crime in ancient Egypt that many tombs have hidden chambers where the family of the deceased would place treasures.

    In Egypt in the mid-1800s, an Egyptian man searching for a lost goat stumbled across the tomb of Pharaoh Ramses I. (Many archaeologists doubt this story and say grave robbers, working as an organized group, routinely scouted and plundered many tombs in the area.) Ramses I ruled for a short time in the 1290s BCE. Besides the body of the pharaoh, the tomb held artifacts such as pottery, paintings, and sculpture. The man sold the mummies and artifacts from the tomb to anyone who would pay.

    The mummy of Ramses I wound up in a museum in Niagara Falls, Ontario, Canada, where it remained until the museum closed in 1999. The Canadian museum sold the Egyptian collection to the Michael C. Carlos Museum in Atlanta, Georgia, which confirmed the mummy’s royal status through the use of CT scanners, X-rays, radiocarbon dating, computer imaging, and other techniques. Ramses I was returned to Egypt in 2003.


    One of the most well-known archaeological finds is the tomb of Pharaoh Tutankhamun, also known as King Tut. Unlike many other Egyptian tombs, grave robbers had never discovered King Tut. His resting place lay undisturbed for thousands of years, until it was discovered in 1922. In addition to mummies of Tutankhamun and his family, the tomb contained some 5,000 artifacts.

    Many early archaeologists worked in the service of invading armies. When Gen. Napoleon Bonaparte of France successfully invaded Egypt in 1798, he brought artists, archaeologists, and historians to document the conquest. Napoleon’s troops took home hundreds of tons of Egyptian artifacts: columns, coffins, stone tablets, monumental statues. Today, these Egyptian antiquities take up entire floors of the Louvre Museum in Paris, France.

    Some archaeologists of this time were wealthy adventurers, explorers, and merchants. These amateur archaeologists often had a sincere interest in the culture and artifacts they studied. However, their work is often regarded as an example of colonialism and exploitation. The so-called Elgin Marbles are an example of this controversy.

    In 1801, Greece had been taken over by the Ottoman Empire. The British ambassador to the Ottoman Empire, Lord Elgin, received permission to remove half of the sculptures from the famous Acropolis of Athens, Greece. These marble sculptures were a part of buildings such as the Parthenon. Lord Elgin claimed he wanted to protect the valuable sculptures from damage caused by conflict between the Greeks and the Ottomans.

    The government of Greece has been lobbying for the return of the Elgin Marbles ever since. Most Greeks view the sculptures as part of their cultural heritage. Greece has cut off diplomatic relations to the United Kingdom several times, demanding the return of the sculptures, which remain in the British Museum in London.

    Eventually, archaeology evolved into a more systematic discipline. Scientists started using standard weights and measures and other formalized methods for recording and removing artifacts. They required detailed drawings and drafts of the entire dig site, as well as individual pieces. Archaeologists began to work with classicists, historians, and linguists to develop a unified picture of the past.

    In the 20th century, archaeologists began to re-assess their impact on the cultures and environments where they dig. Today, in most countries, archaeological remains become the property of the country where they were found, regardless of who finds them. Egypt, for example, is scattered with archaeological sites sponsored by American universities. These teams must obtain permission from the Egyptian government to dig at the sites, and all artifacts become the property of Egypt.

    Disciplines of Archaeology

    Archaeology is based on the scientific method. Archaeologists ask questions and develop hypotheses. They use evidence to choose a dig site, then use scientific sampling techniques to select where on the site to dig. They observe, record, categorize, and interpret what they find. Then they share their results with other scientists and the public.

    Underwater archaeologists study materials at the bottom of lakes, rivers, and oceans. Underwater archaeology encompasses any prehistoric and historic periods, and almost all sub-disciplines as archaeology. Artifacts and features are simply submerged. 

    Artifacts studied by underwater archaeologists could be the remains of a shipwreck. In 1985, National Geographic Explorer-in-Residence Dr. Robert Ballard helped locate the wreck of RMS Titanic, which sank in the North Atlantic Ocean in 1912, killing about 1,500 people. Ballard and other scientists used sonar to locate the wreck, which had been lost since the ocean liner sank. By exploring Titanic using remote-controlled cameras, Ballard and his crew discovered facts about the shipwreck (such as the fact the ship broke in two large pieces as it sank) as well as hundreds of artifacts, such as furniture, lighting fixtures, and children’s toys.

    Underwater archaeology includes more than just shipwrecks, however. Sites include hunt camps on the continental shelf of the Gulf of Mexico, and portions of the ancient city of Alexandria, Egypt, submerged due to earthquakes and sea level rise.

    This basic framework carries across many different disciplines, or areas of study, within archaeology.


    Prehistoric and Historic Archaeology
    There are two major disciplines of archaeology: prehistoric archaeology and historic archaeology. Within these groups are subdisciplines, based on the time period studied, the civilization studied, or the types of artifacts and features studied.

    Prehistoric archaeology deals with civilizations that did not develop writing. Artifacts from these societies may provide the only clues we have about their lives. Archaeologists studying the Clovis people, for instance, have only arrowheads—called projectile points— and stone tools as artifacts. The unique projectile points were first discovered in Clovis, New Mexico, in the United States, and the culture was named after the town. So-called Clovis points establish the Clovis people as one of the first inhabitants of North America. Archaeologists have dated Clovis points to about 13,000 years ago.

    A subdiscipline of prehistoric archaeology is paleopathology. Paleopathology is the study of disease in ancient cultures. (Paleopathology is also a subdiscipline of historical archaeology.) Paleopathologists may investigate the presence of specific diseases, what areas lacked certain diseases, and how different communities reacted to disease. By studying the history of a disease, paleopathologists may contribute to an understanding of the way modern diseases progress. Paleopathologists can also find clues about people’s overall health. By studying the teeth of ancient people, for example, paleopathologists can deduce what kinds of food they ate, how often they ate, and what nutrients the foods contained.

    Historic archaeology incorporates written records into archaeological research. One of the most famous examples of historic archaeology is the discovery and decipherment of the Rosetta Stone. The Rosetta Stone is a large slab of marble discovered near Rashid, Egypt, by French archaeologists in 1799. It became an important tool of historic archaeology.

    The stone is inscribed with a decree made on behalf of Pharaoh Ptolemy V. The decree was written and carved into the stone in three different languages: hieroglyphic, demotic, and Greek. Hieroglyphics are the picture-symbols used for formal documents in ancient Egypt. Demotic is the informal script of ancient Egypt. Before the discovery of the Rosetta Stone, Egyptologists did not understand hieroglyphics or demotic. They could, however, understand Greek. Using the Greek portion of the Rosetta Stone, archaeologists and linguists were able to translate the text and decipher hieroglyphs. This knowledge has contributed vastly to our understanding of Egyptian history.

    Historic archaeology contributes to many disciplines, including religious studies. The Dead Sea Scrolls, for instance, are a collection of about 900 documents. The tightly rolled parchment and other writing sheets were found between 1947 and 1956 in 11 caves near Qumran, West Bank, near the Dead Sea. Among the scrolls are texts from the Hebrew Bible, written in Hebrew, Aramaic, and Greek.

    The Dead Sea Scrolls are the oldest versions of Biblical texts ever found, dating from between the third century BCE to the first century CE. The scrolls also contain texts, psalms, and prophecies that are not part of today’s Bible. Discovery of the scrolls has increased our knowledge of the development of Judaism and Christianity.

    A subdiscipline of historic archaeology is industrial archaeology. Industrial archaeologists study materials that were created or used after the Industrial Revolution of the 1700s and 1800s. The Industrial Revolution was strongest in Western Europe and North America, so most industrial archaeologists study artifacts found there.

    One of the most important sites for industrial archaeologists is the Ironbridge Gorge in Shropshire, England. The River Severn runs through the gorge, and during the Industrial Revolution, it allowed for the transport of raw materials such as coal, limestone, and iron. In fact, the world’s first iron bridge spans the Severn there. By studying artifacts and features (such as the iron bridge), industrial archaeologists are able to trace the area’s economic development as it moved from agriculture to manufacturing and trade.

    Other Disciplines
    Ethnoarchaeologists study how people use and organize objects today. They use this knowledge to understand how people used tools in the past. Archaeologists researching the ancient San culture of southern Africa, for instance, study the way modern San culture functions. Until the mid-20th century, the San, sometimes called the Bushmen, maintained a somewhat nomadic lifestyle based on hunting and gathering. Although the San culture had evolved significantly, archaeologists studying the tools of the modern San could still study the way ancient San tracked and hunted animals and gathered native plants.

    Environmental archaeologists help us understand the environmental conditions that influenced people in the past. Sometimes, environmental archaeology is called human paleoecology. Environmental archaeologists discovered that the expansion of the Taquara/Itararé people of the Brazilian highlands is closely linked with the expansion of the evergreen forest there. The forest grew as the climate became wetter. As the forest provided more resources to the Taquara/Itararé people (timber, as well as plants and animals that depended on the evergreen trees), they were able to expand their territory.


    Experimental archaeologists replicate the techniques and processes people used to create or use objects in the past. Often, re-creating an ancient workshop or home helps experimental archaeologists understand the process or method used by ancient people to create features or artifacts. One of the most famous examples of experimental archaeology is the Kon-Tiki, a large raft built by Norwegian explorer Thor Heyerdahl. In 1947, Heyerdahl sailed the Kon-Tiki from South America to Polynesia to show that ancient mariners, with the same tools and technology, could have navigated the vast Pacific Ocean.

    Forensic archaeologists sometimes work with geneticists to support or question DNA evidence. More often, they excavate the remains of victims of murder or genocide in areas of conflict. Forensic archaeology is important to the understanding of the “Killing Fields” of Cambodia, for instance. The Killing Fields are the sites of mass graves of thousands of victims of the Khmer Rouge regime of the 1970s. After the fall of the Khmer Rouge, forensic archaeologists studied the remains of the bodies in the Killing Fields, discovering how and when they died. The forensic archaeologists helped establish that the Khmer Rouge used starvation and overwork, as well as direct killing, to silence opponents of the regime.

    Archaeologists working in the field of cultural resource management help assess and preserve remains on sites where construction is scheduled to occur. Archaeologists working as cultural resource managers often collaborate with local governments to balance the infrastructure and commercial needs of a community with historic and cultural interests represented by artifacts and features found on construction sites.

    Where to Dig?

    Most archaeology involves digging. Winds and floods carry sand, dust and soil, depositing them on top of abandoned features and artifacts. These deposits build up over time, burying the remains. Sometimes catastrophes, like volcanic eruptions, speed up this burial process. In places where earth has been carved away—like in the Grand Canyon in the U.S. state of Arizona—you can actually see the layers of soil that have built up over the centuries, like layers of a cake.

    Cities and communities also tend to be built in layers. Rome, Italy, has been an urban center for thousands of years. The streets of downtown Rome today are several meters higher than they were during the time of Julius Caesar. Centuries of Romans have built it up—medieval home on top of ancient home, modern home on top of medieval home.

    Establishing a dig site in an inhabited area can be a very difficult process. Not only are the inhabitants of the area inconvenienced, archaeologists don’t know what they may find. Archaeologists looking for an ancient Roman fortress, for instance, may have to first excavate a Renaissance bakery and medieval hospital.

    Because most artifacts lie underground, scientists have developed methods to help them figure out where they should dig. Sometimes they choose sites based on old myths and stories about where people lived or where events occurred. The ancient city of Troy, written about by Greek poet Homer as early as 1190 BCE, was thought to be a work of fiction. Homer’s epic poem the Iliad was named after Troy, which the Greeks knew as Ilion. Using the Iliad as a guide, German amateur archaeologist Heinrich Schliemann discovered the ruins of the city near the town of Hisarlik, Turkey, in 1870. Schliemann’s find helped provide evidence that the Trojan War may have actually taken place, and that ancient manuscripts may be based on fact.

    Sometimes, archaeologists use historical maps to find ancient artifacts. In 1973, for instance, archaeologists used historical maps and modern technology to locate the wreck of the USS Monitor, an “ironclad” ship used by the Union during the Civil War. The Monitor sunk in a storm off the coast of Cape Hatteras, North Carolina, in 1862. After archaeologists identified the ironclad, the United States designated the area as the nation’s first marine sanctuary.

    Before securing a site, an archaeological team surveys the area, looking for signs of remains. These might include artifacts on the ground or unusual mounds in the earth. New technology has greatly increased their ability to survey an area. For example, aerial and satellite imagery can show patterns that might not be visible from the ground.

    Other technologies give clues about what lies under the surface. These techniques involve radar and sonar. Radar and sonar technologies often use radio waves, electrical currents, and lasers. Archaeologists send these signals into the earth. As the signals hit something solid, they bounce back up to the surface. Scientists study the time and paths the signals take to familiarize themselves with the underground landscape.

    Accidental finds can also lead archaeologists to dig sites. For instance, farmers plowing their fields might come across sherds of pottery. A construction crew might discover ruins beneath a building site.


    Another monumental discovery was made by accident. In 1974, agricultural workers in Xian, China, were digging a well. They discovered the remains of what turned out to be an enormous mausoleum for Qin Shi Huangdi, China’s first emperor. The complex includes 8,000 life-sized clay soldiers, horses, chariots, and artillery, popularly known as the Terra Cotta Warriors. The archaeological research surrounding the Terra Cotta Warriors has provided insight on the organization and leadership style of Qin Shi Huangdi and the development of Chinese culture.

    Once a site is chosen, archaeologists must get permission to dig from the landowner. If it is public land, they must obtain the proper permits from the local, state, or federal government.

    Before moving a single grain of dirt, archaeologists make maps of the area and take detailed photographs. Once they begin digging, they will destroy the original landscape, so it is important to record how things looked beforehand.

    The last step before digging is to divide the site into a grid to keep track of the location of each find. Then archaeologists choose sample squares from the grid to dig. This allows the archaeological team to form a complete study of the area. They also leave some plots on the grid untouched. Archaeologists like to preserve portions of their dig sites for future scientists to study—scientists who may have better tools and techniques than are available today.

    For example, during the Great Depression in the 1930s, programs to create jobs led to many archaeological digs around the United States. Some scientists on these digs removed artifacts, such as pottery, but threw away charcoal and animal bones. These items were considered junk. Today, scientists are able to carbon-date the charcoal and analyze the bones to see what kinds of animals people were domesticating and eating at the time. It is important that archaeologists today keep some parts of each site pristine.

    Not all archaeology involves digging in the earth. Archaeologists and engineers work with sophisticated technology to probe the earth below without disturbing the ground. National Geographic Emerging Explorer Dr. Albert Yu-Min Lin leads an innovative archaeological project centered in Mongolia. The Valley of the Khans project is using digital imaging, aerial photography, radar, and digital surveying to locate the tomb of Genghis Khan. Using satellite technology, Lin and his team can access information about the project without disturbing the land or even going to Mongolia.

    The Big Dig

    The process of researching and securing a dig site can take years. Digging is the field work of archaeology. On occasion, archaeologists might need to move earth with bulldozers and backhoes. Usually, however, archaeologists use tools such as brushes, hand shovels, and even toothbrushes to scrape away the earth around artifacts.

    The most common tool that archaeologists use to dig is a flat trowel. A trowel is a hand-held shovel used for smoothing as well as digging. Archaeologists use trowels to slowly scrape away soil. For very small or delicate remains, archaeologists might also dig with dental picks, spoons, or very fine blades. Often, they will sift dirt through a fine mesh screen. Tiny remains, such as beads, can often be found this way.

    Archaeologists take lots of notes and photographs along each step of the process. Sometimes they include audio and video recordings. Global positioning system (GPS) units and data from geographic information systems (GIS) help them map the location of various features with a high level of precision.

    When archaeologists find remains, they are often broken or damaged after hundreds or even thousands of years underground. Sunlight, rain, soil, animals, bacteria, and other natural processes can cause artifacts to erode, rust, rot, break, and warp.

    Sometimes, however, natural processes can help preserve materials. For example, sediments from floods or volcanic eruptions can encase materials and preserve them. In one case, the chill of an Alpine glacier preserved the body of a man for more than 5,300 years! The discoverer of the so-called “Iceman,” found in the Alps between Switzerland and Italy, thought he was a recent victim of murder, or one of the glacier’s crevasses. Forensic archaeologists studying his body were surprised to learn that he was a murder victim—the crime just took place more than 5,000 years ago.

    Uncovered Artifacts

    As artifacts are uncovered, the archaeological team records every step of the process through photos, drawings, and notes. Once the artifacts have been completely removed, they are cleaned, labeled, and classified.

    Particularly fragile or damaged artifacts are sent to a conservator. Conservators have special training in preserving and restoring artifacts so they are not destroyed when exposed to air and light. Textiles, including clothing and bedding, are especially threatened by exposure. Textile conservators must be familiar with climate, as well as the chemical composition of the cloth and dyes, in order to preserve the artifacts.

    In 1961, Swedish archaeologists recovered the ship Vasa, which sank in 1628. Conservators protected the delicate oak structure of Vasa by spraying it with polyethylene glycol (PEG). The ship was sprayed with PEG for 17 years, and allowed to dry for nine. Today, Vasa sits in its own enormous museum, a hallmark of Swedish heritage.

    Then the artifacts are sent to a lab for analysis. This is usually the most time-consuming part of archaeology. For every day spent digging, archaeologists spend several weeks processing their finds in the lab.

    All of this analysis—counting, weighing, categorizing—is necessary. Archaeologists use the information they find and combine it with what other scientists have discovered. They use the combined data to add to the story of humanity’s past. When did people develop tools, and how did they use them? What did they use to make clothing? Did their clothing styles indicate their social ranks and roles? What did they eat? Did they live in large groups or smaller family units? Did they trade with people from other regions? Were they warlike or peaceful? What were their religious practices? Archaeologists ask all of these questions and more.

    The scientists write up their findings and publish them in scientific journals. Other scientists can look at the data and debate the interpretations, helping us get the most accurate story. Publication also lets the public know what scientists are learning about our history.

  • Term Part of Speech Definition Encyclopedic Entry
    abandoned Adjective

    deserted.

    accurate Adjective

    exact.

    Acropolis Noun

    large, flat-topped hill that is the highest point of the city of Athens, Greece.

    aerial photograph Noun

    picture of part of the Earth's surface, usually taken from an airplane.

    agriculture Noun

    the art and science of cultivating the land for growing crops (farming) or raising livestock (ranching).

    Encyclopedic Entry: agriculture
    alpine glacier Noun

    mass of ice that moves downward from a mountain.

    Alps Plural Noun

    (highest peak: Mont Blanc, 4,807 meters/15,771 feet) large mountain range in southern Europe.

    amateur Adjective

    person who studies and works at an activity or interest without financial benefit or being formally trained in it.

    ambassador Noun

    person who represents a place, organization, or idea.

    analysis Noun

    process of studying a problem or situation, identifying its characteristics and how they are related.

    ancestry Noun

    family (genealogical) or historical background.

    ancient Adjective

    very old.

    antiquity Noun

    ancient object.

    archaeologist Noun

    person who studies artifacts and lifestyles of ancient cultures.

    archaeology Noun

    study of human history, based on material remains.

    Encyclopedic Entry: archaeology
    artifact Noun

    material remains of a culture, such as tools, clothing, or food.

    artillery Noun

    weapons that launch or fire large projectiles, such as cannons or catapults.

    assess Verb

    to evaluate or determine the amount of.

    backhoe Noun

    large piece of construction equipment consisting of a digging bucket on a maneuverable arm.

    bacteria Plural Noun

    (singular: bacterium) single-celled organisms found in every ecosystem on Earth.

    Bible Noun

    holy book of the Christian religion.

    bulldozer Noun

    vehicle used for moving large obstacles, such as boulders or trees.

    carbon-date Verb

    to estimate the age of an organism by tracking the decay of the isotope carbon-14. Also called radiocarbon dating.

    catastrophe Noun

    disaster or sudden, violent change.

    charcoal Noun

    carbon material made by burning wood or other organic material with little air.

    chariot Noun

    vehicle with two or four wheels and pulled by horses.

    Christianity Noun

    religion based on the teachings of Jesus of Nazareth.

    civilization Noun

    complex way of life that developed as humans began to develop urban settlements.

    Encyclopedic Entry: civilization
    Civil War Noun

    (1860-1865) American conflict between the Union (north) and Confederacy (south).

    classicist Noun

    person who studies ancient Greek and Roman civilization.

    climate Noun

    all weather conditions for a given location over a period of time.

    Encyclopedic Entry: climate
    Clovis people Noun

    (13000-9000 BCE) one of the first people and cultures native to North America. Also called Llano.

    Clovis point Noun

    style of stone knife, spearhead, or arrowhead (projectile point) found throughout North America and associated with the ancient Clovis culture.

    coal Noun

    dark, solid fossil fuel mined from the earth.

    coast Noun

    edge of land along the sea or other large body of water.

    Encyclopedic Entry: coast
    coffin Noun

    box containing the body of a dead person.

    colonialism Noun

    type of government where a geographic area is ruled by a foreign power.

    commercial Adjective

    having to do with the buying and selling of goods and services.

    community Noun

    group of organisms or a social group interacting in a specific region under similar environmental conditions.

    complex Adjective

    complicated.

    conflict Noun

    a disagreement or fight, usually over ideas or procedures.

    conquest Noun

    victory.

    conservator Noun

    person who repairs, restores, or maintains the quality of valuable items.

    continental shelf Noun

    part of a continent that extends underwater to the deep-ocean floor.

    Encyclopedic Entry: continental shelf
    controversy Noun

    disagreement or debate.

    crevasse Noun

    deep crack in a glacier.

    Encyclopedic Entry: crevasse
    CT scanner Noun

    (computerized tomography scanner) device combining X-ray and computerized equipment to provide cross-sectional images of internal body structures. Also called a CAT scanner.

    cultural heritage Noun

    traditions and customs of a specific population.

    cultural resource management Noun

    the practice of studying and preserving ancient remains on sites where construction is scheduled to occur.

    current Noun

    steady, predictable flow of fluid within a larger body of that fluid.

    Encyclopedic Entry: current
    data Plural Noun

    (singular: datum) information collected during a scientific study.

    Dead Sea Scrolls Noun

    (100 BCE - 135 CE) leather, papyrus, and copper scrolls containing ancient Jewish writings.

    debate Verb

    to argue or disagree in a formal setting.

    deceased Adjective

    dead.

    decipher Verb

    to figure out or interpret.

    decree Noun

    formal or legal order.

    deduce Verb

    to reach a conclusion based on clues or evidence.

    demotic Noun

    (700 BCE - 400 CE) informal written language of ancient Egypt.

    dental pick Noun

    small, sharp instrument used to remove material from teeth.

    designate Verb

    to name or single out.

    digital imaging Noun

    process of creating, processing, storing, and displaying images made from binary code.

    diplomatic relations Noun

    the formal ties between nations.

    discipline Noun

    field of study.

    disease Noun

    a harmful condition of a body part or organ.

    DNA Noun

    (deoxyribonucleic acid) molecule in every living organism that contains specific genetic information on that organism.

    domesticate Verb

    to tame or adapt for human use.

    dust Noun

    tiny, dry particles of material solid enough for wind to carry.

    Encyclopedic Entry: dust
    dye Noun

    pigment used to color cloth or another object.

    earthquake Noun

    the sudden shaking of Earth's crust caused by the release of energy along fault lines or from volcanic activity.

    economic Adjective

    having to do with money.

    Egyptologist Noun

    person who studies the culture and history of ancient Egypt.

    Elgin Marbles Noun

    (440-430 BCE) large collection of ancient Greek statuary displayed in the British Museum, London, England. Also called the Parthenon Marbles.

    Emerging Explorer Noun

    an adventurer, scientist, innovator, or storyteller recognized by National Geographic for their visionary work while still early in their careers.

    emperor Noun

    ruler of an empire.

    encase Verb

    to enclose or completely confine.

    engineer Noun

    person who plans the building of things, such as structures (construction engineer) or substances (chemical engineer).

    enormous Adjective

    very large.

    environmental archaeologist Noun

    person who studies how environmental conditions influenced people in the past.

    erode Verb

    to wear away.

    ethnoarchaeologist Noun

    person who studies how people today use and organize objects in order to understand how they used and organized objects in the past.

    evergreen Noun

    tree that does not lose its leaves.

    excavate Verb

    to expose by digging.

    experimental archaeologist Noun

    person who replicates techniques and processes used to create or use objects in the past.

    exploit Verb

    to use or take advantage of for profit.

    explorer Noun

    person who studies unknown areas.

    Explorer-in-Residence Noun

    pre-eminent explorers and scientists collaborating with the National Geographic Society to make groundbreaking discoveries that generate critical scientific information, conservation-related initiatives and compelling stories.

    extend Verb

    to enlarge or continue.

    extinct Adjective

    no longer existing.

    familiarize Verb

    to understand how something works or operates.

    feature Noun

    non-portable archaeological remains, such as pyramids or post-holes.

    fiction Noun

    media, such as books or films, that are imaginative and not true stories.

    field work Noun

    scientific studies done outside of a lab, classroom, or office.

    Encyclopedic Entry: field work
    flood Noun

    overflow of a body of water onto land.

    Encyclopedic Entry: flood
    fluent Adjective

    able to speak, write, and understand a language.

    food Noun

    material, usually of plant or animal origin, that living organisms use to obtain nutrients.

    Encyclopedic Entry: food
    forensic archaeologist Noun

    person who excavates and studies the remains and artifacts surrounding areas containing graves, or sites of murder or genocide.

    formal Adjective

    official or standardized.

    fortress Noun

    protected place. Also called a fort.

    fragile Noun

    delicate or easily broken.

    geneticist Noun

    scientist who studies the chemistry, behavior, and purposes of DNA, genes, and chromosomes.

    Genghis Khan Noun

    (1162-1227) founder of the Mongol empire.

    genocide Noun

    intentional mass murder of a specific religious, cultural, or ethnic group.

    geographic information system (GIS) Noun

    any system for capturing, storing, checking, and displaying data related to positions on the Earth's surface.

    Encyclopedic Entry: GIS (geographic information system)
    glacier Noun

    mass of ice that moves slowly over land.

    Encyclopedic Entry: glacier
    Global Positioning System (GPS) Noun

    system of satellites and receiving devices used to determine the location of something on Earth.

    glyph Noun

    written mark or sign that indicates the meaning of what is written, such as a letter or symbol.

    gorge Noun

    deep, narrow valley with steep sides, usually smaller than a canyon.

    Encyclopedic Entry: gorge
    govern Verb

    to make public-policy decisions for a group or individuals.

    government Noun

    system or order of a nation, state, or other political unit.

    Grand Canyon Noun

    large gorge made by the Colorado River in the U.S. state of Arizona.

    grave robber Noun

    person who steals valuable objects from a tomb, mausoleum, or other burial site.

    Great Depression Noun

    (1929-1941) period of very low economic activity in the U.S. and throughout the world.

    grid Noun

    horizontal and vertical lines used to locate objects in relation to one another on a map.

    Hebrew Bible Noun

    holy writings of the Jewish faith that correspond with the Old Testament writings of the Christian faith. Also called the Hebrew Scriptures.

    Heinrich Schliemann Noun

    (1822-1890) German archaeologist.

    heritage Noun

    cultural or family background.

    hieroglyphics Plural Noun

    written language using pictures to represent words or ideas.

    highlands Plural Noun

    plateau or elevated region of land.

    historical map Noun

    representation of spatial information displaying sites of historical interest.

    historic archaeology Noun

    study of people, culture, and civilizations that developed writing systems.

    Homer Noun

    (~800 BCE) probably fictitious author of the ancient Greek epics The Iliad and The Odyssey.

    hypothesis Noun

    statement or suggestion that explains certain questions about certain facts. A hypothesis is tested to determine if it is accurate.

    Iceman Noun

    (3300-3255 BCE) naturally mummified body of a man found in the Alps between Italy and Switzerland. Nicknamed "Otzi."

    Iliad Noun

    (1180-1195 BCE) epic by the Greek poet Homer, about events of the Trojan War.

    inconvenience Verb

    to disturb or bother.

    industrial archaeology Noun

    study of the materials created during the Industrial Revolution.

    Industrial Revolution Noun

    change in economic and social activities, beginning in the 18th century, brought by the replacement of hand tools with machinery and mass production.

    influence Verb

    to encourage or persuade a person or organization to act a certain way.

    infrastructure Noun

    structures and facilities necessary for the functioning of a society, such as roads.

    inhabit Verb

    to live in a specific place.

    innovative Adjective

    new, advanced, or original.

    inscribe Verb

    to mark or engrave a surface.

    iron Noun

    chemical element with the symbol Fe.

    ironclad Noun

    steam-propelled warship protected by plates of iron or another metal.

    Jewish Adjective

    having to do with the religion or culture of people tracing their ancestry to the ancient Middle East and the spiritual leaders Abraham, Isaac, and Jacob.

    Judaism Noun

    religion based on the holy book of the Torah and the teaching surrounding it.

    Julius Caesar Noun

    (100 BCE-44 BCE) leader of ancient Rome.

    Khmer Rouge Noun

    (1975-1979) communist, dictatorial government of Cambodia led by Pol Pot.

    Killing Fields Noun

    sites in Cambodia where thousands of victims of the Khmer Rouge regime are buried in mass graves.

    Kon-Tiki Noun

    (1947) raft used by explorer Thor Heyerdahl to sail from South America to the Polynesian islands.

    lab Noun

    (laboratory) place where scientific experiments are performed.

    landscape Noun

    the geographic features of a region.

    Encyclopedic Entry: landscape
    laser Noun

    (acronym for light amplification by stimulated emission of radiation) an instrument that emits a thin beam of light that does not fade over long distances.

    Latin Noun

    language of ancient Rome and the Roman Empire.

    limestone Noun

    type of sedimentary rock mostly made of calcium carbonate from shells and skeletons of marine organisms.

    linguist Noun

    person who studies language.

    lobby Verb

    to try to influence the action of government or other authority.

    looter Noun

    thief.

    magnificent Adjective

    very impressive.

    manufacturing Noun

    production of goods or products in a factory.

    manuscript Noun

    written material.

    marble Noun

    type of metamorphic rock.

    mariner Noun

    sailor.

    marine sanctuary Noun

    part of the ocean protected by the government to preserve its natural and cultural features while allowing people to use and enjoy it in a sustainable way.

    Encyclopedic Entry: marine sanctuary
    mass grave Noun

    large burial site with many corpses, usually unidentified.

    mausoleum Noun

    impressive tomb or burial site.

    Maya Noun

    people and culture native to southeastern Mexico and Central America.

    medieval Adjective

    having to do with the Middle Ages (500-1400) in Europe.

    merchant Noun

    person who sells goods and services.

    mesh noun, adjective

    sheet of wires woven together with small, uniform openings.

    monarch Noun

    king or queen.

    Monitor Noun

    (1861-1862) steam-powered military ship protected by metal plates (an "ironclad") commissioned by the U.S. Navy during the Civil War.

    monolith Noun

    tall column or statue made from a single block of stone.

    monument Noun

    large structure representing an event, idea, or person.

    mummy Noun

    corpse of a person or animal that has been preserved by natural environmental conditions or human techniques.

    murder Verb

    to kill a person.

    museum Noun

    space where valuable works of art, history, or science are kept for public view.

    myth Noun

    legend or traditional story.

    Napoleon Bonaparte Noun

    (1769-1821) military general and emperor of France.

    navigate Verb

    to plan and direct the course of a journey.

    nomadic Adjective

    having to do with a way of life lacking permanent settlement.

    nutrient Noun

    substance an organism needs for energy, growth, and life.

    Encyclopedic Entry: nutrient
    obtain Verb

    to get or take possession of.

    Ottoman Empire Noun

    (1299-1923) empire based in Turkey and stretching throughout southern Europe, the Middle East, and North Africa.

    overwork Verb

    to demand too much of someone or something.

    paleopathology Noun

    study of the history of a disease or the history of disease in ancient cultures.

    parchment Noun

    carefully prepared skin of goats or other animals used as material on which to write.

    Parthenon Noun

    (438 BCE) ancient temple to the goddess Athena on the Acropolis of Athens, Greece.

    permit Noun

    official, written permission to do something. Sometimes called a license.

    pharaoh Noun

    ruler of ancient Egypt.

    plow noun, verb

    tool used for cutting, lifting, and turning the soil in preparation for planting.

    plunder Verb

    to rob or steal.

    Polynesia Noun

    island group in the Pacific Ocean between New Zealand, Hawaii, and Easter Island.

    portable Adjective

    able to be easily transported from one place to another.

    post-hole Noun

    depression where supports (posts) for a structure once stood.

    pottery Noun

    pots, vessels, or other material made from clay or ceramic.

    pre-Columbian Adjective

    having to do with the Americas before the arrival of Christopher Columbus in 1492.

    prehistoric Adjective

    period of time that occurred before the invention of written records.

    prehistoric archaeology Noun

    study of people, culture, and civilizations that did not develop writing systems.

    prior Adjective

    before or ahead of.

    pristine Adjective

    pure or unpolluted.

    projectile point Noun

    archaeological term used to describe a sharp stone tool, such as an arrowhead, spearhead, dart, or blade.

    prophecy Noun

    prediction of the future.

    psalm Noun

    sacred song or musical poem.

    Ptolemy I Noun

    (367-283 BCE) Greek general who became pharaoh of Egypt. Also called Ptolemy Soter.

    Ptolemy V Noun

    (210-181 BCE) Egyptian pharaoh. Also called Ptolemy Epiphanes.

    publish Verb

    to provide a written piece of work, such as a book or newspaper, for sale or distribution.

    pyramid Noun

    three-dimensional shape with a square base and triangular sides that meet in a point.

    Qin Shi Huangdi Noun

    (259-210 BCE) first emperor of China.

    radar Noun

    (RAdio Detection And Ranging) method of determining the presence and location of an object using radio waves.

    radiocarbon dating Noun

    to estimate the age of an organism by tracking the decay of the isotope carbon-14. Also called carbon-dating.

    radio wave Noun

    electromagnetic wave with a wavelength between 1 millimeter and 30,000 meters, or a frequency between 10 kilohertz and 300,000 megahertz.

    raw material Noun

    matter that needs to be processed into a product to use or sell.

    regime Noun

    system of government.

    rely Verb

    to depend on.

    Renaissance Noun

    period of great development in science, art, and economy in Western Europe from the 14th to the 17th centuries.

    Robert Ballard Noun

    (1942-present) oceanographer and National Geographic Explorer-in-Residence.

    Roman Empire Noun

    (27 BCE-476 CE) period in the history of ancient Rome when the state was ruled by an emperor.

    Rosetta Stone Noun

    (196 BCE) large black stone carved with a decree about the coronation of Pharaoh Ptolemy V. The decree is carved in three languages: Greek, demotic, and hieroglyphic.

    rot Verb

    to decay or spoil.

    rust Verb

    to dissolve and form a brittle coating, as iron does when exposed to air and moisture.

    San Noun

    people and culture native to southern Africa. Also called Bushmen.

    sand Noun

    small, loose grains of disintegrated rocks.

    satellite imagery Noun

    photographs of a planet taken by or from a satellite.

    scholar Noun

    educated person.

    scientific journal Noun

    magazine that focuses on developments in scientific research.

    scientific method Noun

    method of research in which a question is asked, data are gathered, a hypothesis is made, and the hypothesis is tested.

    script Noun

    text or system of writing.

    scroll Noun

    rolled-up sheet of paper or other thin material for writing.

    sea level rise Noun

    increase in the average reach of the ocean. The current sea level rise is 1.8 millimeters (.07 inch) per year.

    sediment Noun

    solid material transported and deposited by water, ice, and wind.

    Encyclopedic Entry: sediment
    sherd Noun

    fragment of pottery. Also shard.

    shipwreck Noun

    remains of a sunken marine vessel.

    sift Verb

    to separate larger pieces of material from smaller ones.

    significant Adjective

    important or impressive.

    sincere Adjective

    genuine or real.

    slab Noun

    flat, thick piece of material such as earth or stone.

    soil Noun

    top layer of the Earth's surface where plants can grow.

    sonar Noun

    method of determining the presence and location of an object using sound waves (echolocation).

    sophisticated Adjective

    knowledgeable or complex.

    specific Adjective

    exact or precise.

    starvation Noun

    dying from lack of food.

    Stonehenge Noun

    prehistoric monument in Salisbury Plain, England.

    storm Noun

    severe weather indicating a disturbed state of the atmosphere resulting from uplifted air.

    subdiscipline Noun

    field of study within a larger area of research.

    submerge Verb

    to put underwater.

    subway Noun

    underground railway; a popular form of public transportation in large urban areas.

    survey Noun

    a study or analysis of characteristics of an area or a population.

    system Noun

    collection of items or organisms that are linked and related, functioning as a whole.

    tax Noun

    money or goods citizens provide to government in return for public services such as military protection.

    technology Noun

    the science of using tools and complex machines to make human life easier or more profitable.

    temple Noun

    building used for worship.

    Terra Cotta Warriors Noun

    (~210 BCE) collection of thousands of life-size clay figures of soldiers, horses, chariots, and other artifacts in Xian, China, buried with Qin Shi Huangdi, China's first emperor.

    territory Noun

    land an animal, human, or government protects from intruders.

    textile Noun

    cloth or other woven fabric.

    Thor Heyerdahl Noun

    (1914-2002) Norwegian explorer.

    timber Noun

    wood in an unfinished form, either trees or logs.

    time-consuming Adjective

    taking a long time to finish.

    Titanic Noun

    luxury cruise ship that sank in the North Atlantic Ocean in 1912.

    tomb Noun

    enclosed burial place.

    trade Noun

    buying, selling, or exchanging of goods and services.

    transportation engineer Noun

    person who plans, designs, and maintains facilities for transporting people and goods.

    Trojan War Noun

    (~1194-1184 BCE) ancient conflict between the Greeks and the Trojans, written about by ancient poets and historians in works such as the Iliad.

    troop Noun

    a soldier.

    trowel Noun

    hand-held shovel with a flat blade.

    Troy Noun

    ancient city on the Aegean coast of what is now northwestern Turkey. Also called Troia and Ilion.

    tunnel-boring machine Noun

    enormous machine that drills tunnels for subways or underground railway lines.

    Tutankhamun Noun

    (1341-1323 BCE) Egyptian pharaoh.

    underwater archaeologist Noun

    person who studies artifacts and features found at the bottom of lakes, rivers, and oceans.

    Union Adjective

    having to do with states supporting the United States (north) during the U.S. Civil War.

    urban center Noun

    densely populated area, usually a city and its surrounding suburbs.

    vast Adjective

    huge and spread out.

    volcanic eruption Noun

    activity that includes a discharge of gas, ash, or lava from a volcano.

    warp Verb

    to bend out of shape.

    wealthy Adjective

    very rich.

    wind Noun

    movement of air (from a high pressure zone to a low pressure zone) caused by the uneven heating of the Earth by the sun.

    X-ray Noun

    radiation in the electromagnetic spectrum with a very short wavelength and very high energy.

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