US Geological Survey
Earth's Water: Rivers and Streams
The USGS explains the definition of a river and how a river is supplied with water. Included is a cross section of a river. Click Home to access the site in Spanish.
PBS
Nh Pbs: Nature Works: Rivers and Streams
Learn more about Rivers and Streams through this educational resource. This site features photographs, a description, fun facts, and more about this type of freshwater ecosystem.