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River Flows In You

July 2009

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Sunday, July 12, 2009 at 12:15 AM
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Erosion

As a river flows, pieces of rock are removed from the river bed and banks, and moved along the channel. This removal and movement of rocks downwards by the river is known as erosion. Erosion causes the river channel to deepen and widen.

Vertical erosion occurs when rocks and other materials on the river bed are removed, causing the channel to become deeper. Lateral erosion occurs when rocks and other materials along the sides of the channel are worn away. This causes the river channel to become wider.

























Type of erosionHydraulic actionCorrasion/ AbrasionAttritionSolution
Erosive Agent
Fast-flowing waterRock FragmentsRock FragmentsCarbonic acid in water
Impact
Rocks and materials along the river bed and river banks are loosened and eventually dislodged.Grinding action of the materials carried by the river results in the erosion of the river bed and banks.Previously eroded materials carried by the river collide against each other and are worn down into smaller pieces.Minerals in rock are dissolved and carried away in the solution.

Source: Earth: Our Home 3 (Full Geography)