Corrasion - erosion caused by rocks in the river wearing away the river bed and banks., Hydraulic action - erosion caused by the power of the water compressing air into cracks in the rock causing it to break apart. , River bed  - the bottom of a river , River banks - the sides of a river, Erosion - when something is worn away , More resistant rock - rock which is harder to erode., Less resistant rock - rock which is easier to erode,

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