deposition - the putting down of material, transportation - the removal of material, erosion - the wearing away of material, load - material carried by the river, abrasion - when rocks scrape away at the river bed and river banks, attrition - when rocks knock into each other and bits break off, making them rounder and smoother, solution - when tiny pieces of rock are dissolved by the water, hydraulic action - when the power of water forces rock apart, suspension - when rocks are carried along in the flow of water, saltation - when rocks bounce along the river bed, traction - when rocks are rolled or dragged along the river bed,

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