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Erosion
the wearing away of rock and soil found along the river bed and bank
hydraulic action
the force of water against the bank causing air to be trapped in cracks. The pressure weakens banks
Abrasion
big boulders roll along the river bed and wear it down. Causes vertical and lateral erosion int he upper course
Attrition
Rocks carried by the river bang against each other. they break into smaller and rounder and smoother particles
Solution
when soluble particles are in the action be being dissolved by the river. Limestone is common
Note 
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