Hydraulic Action - a process of erosion involving water and air trapped in cracks and crevices , Abrasion - a type of erosion involving rock particles being scraped against, and wearing away, the surface of other rocks , Attrition - a type of erosion involving rock fragments being ground together to become smaller, smoother and rounder , Corrosion -  a chemical process involving the dissolving away of sedimentary rocks, e.g. chalk, limestone  , Saltation - the transport of sand in a hopping fashion in water or air , Solution - Materials transported by being dissolved into water, Suspension - Material carried in the flow of a river, Traction - Particles rolling along the river bed, Deposition - The load of a river being dumped towards the lower course of a river due to a decrease in energy,

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