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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.

river
river Encyclopedic Entry

Best For
5-12+

Subjects
Geography, Science

Appropriate For

  • Educators
  • Families
  • Students

Encyclopedic entry. A river is a large, natural stream of flowing water. Rivers are found on every continent and on nearly every kind of land.