The Secret Life of Rivers: Rocks. 

Just as important as the water in a river is the rock in its bed, shaping life...
Video #3 in "The Secret Life of Rivers" 6-part video series.
Brought to you by Leavenworth Fisheries Complex, which includes Entiat National Fish Hatchery, Leavenworth National Fish Hatchery, Winthrop National Fish Hatchery, Mid-Columbia Fish and Wildlife Conservation Office. Visit www.fws.gov/le... for more info.
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