Types of River Erosion

The 5 types of erosion as stated in the CGP AQA revision guide

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Hydraulic Action

Hydraulic Action- 

The Pressure of the water breaks rock particles away from the bed and banks. It is strongest in rapids and Waterfalls 

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Abrasion (corrasion)

Abrasion (corrasion)- 

Eroded pieces of rock in the water scrape and rub against the bed and banks, removing material. Most Erosion of river beds and banks happens by Abrasion 

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Attrition

Attrition- Eroded rocks Smash into each other and break into smaller fragments. Their edges get rounded off as the rub together. Attrition doesn't erode the bed and banks- it just makes the particles of rock in the river smaller and more rounded

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Caviation-Air Bubbles

Caviation-

Air bubbles in turbulent stretches of water implode causing shock waves the break pieces of rock off the banks and bed

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Corrosion

Corrosion-

The dissolving of rock by chemical processes. Carbon Dioxide dissolves in water to form a weak acid, which reacts with rocks like limestone and chalk, breaking them down.

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