Hydraulic action - the force of the river against the banks can cause air to be trapped in cracks and crevices. The pressure of this air weakens the banks and gradually wears it away., Abrasion - rocks carried along by the river scratch and wear down the river bed and banks., Attrition - rocks being carried by the river smash together and break into smaller, smoother and rounder particles., Solution - acids in the water dissolve some particles in the rock,

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