Attrition - rocks smashing against each other, becoming smaller and rounder as they break down, ABRASION - rocks in the rivers being thrown against the river bed and banks, wearing them away like sandpaper, HYDRAULIC ACTION - the breaking away of the river bed and banks by the sheer force of the water getting into small cracks, Corrosion - acids and salts in the water dissolve minerals in the rocks, washing them away,

River erosion processes

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