Abrasion- is the scrapping, scouring and rubbing action of materials carried along the river. Rivers carry rock fragments in the flow of the water or grag them along the bed, and in doing so wear away the banks and bed of the river channel.
Hydraulic power- is caused by the sheer power of the moving water. It is the movement of loose unconsolidated material due to the frictional drag of the moving water on the sediment or lying on the channel bed.
Corrosion- is most active on rocks that contain carbonates. The materials in the rock are dissolved by weak acids in the river water and is carried away as a solution.
Attrition- is the reduction in the size of fragments and particles within a river due to the processes described above. Fragments strike each other as well as the riverbed, making it smoother, smaller, and more rounded as they move along the river channel.
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