abrasion - this process involves the river beds and banks being worn down by the rivers load at high velocity
hydraulic action - this is the process of the river beds and banks being worn down by the force of the river water
attrition - this is the process where the river picks up material and the material bangs into each other, breaking down and smoothing
corrosion - this is a chemical action of the acid in the river water slowely dissolving the bed and the banks
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