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tributary
tributary Encyclopedic Entry

Best For
6-12+

Subjects
Geography, Science

Appropriate For

  • Educators
  • Families
  • Students

A tributary is a freshwater stream that feeds into a larger stream, river or other body of water. The larger, or parent, river is called the mainstem.

delta
delta Encyclopedic Entry

Best For
5-12+

Subjects
Geography, Science

Appropriate For

  • Educators
  • Families
  • Students

Deltas form as rivers empty their water and sediment into another body of water, such as an ocean, lake, or another river.