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rivers - Coggle Diagram
rivers
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transportation
Traction happens when larger rocks (boulders and large pebbles) are rolled along the riverbed by the force of the water.This takes a lot of energy.
Saltation happens when lighter rocks (small pebbles and sand) are bounced along the bottom of the river channel.
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As a river flows along its course, the channel changes shape in 3 ways.
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The middle course is less steep than the upper course, but more steep than the lower course.
The lower course has the shallowest gradient, here the valley is almost flat.
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The middle course is wider and less deep than the upper course, but not as wide or shallow as the lower course.
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