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Rivers are kept full by thawing snow in higher elevations that run downhill for centuries along the same path....as time goes by, the river digs deeper and deeper into the ground. There are actually lots of rivers in the deserts, they are all just covered up by sand and underground.

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When rain falls, some of it sinks into the ground, but not of it. The water that flows over land is called surface runoffor overland flow. Overland flows remove soil and rock, and carve out channels and streams. These channels eventually deepen into rivers.

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15y ago

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