There are 4 types of erosion:
1 - Hydraulic Action; The force of the river can cause air to get into the crevises of the rocks, the pressure weakens the rock and pieces gradually fall away.
2 - Abraison; Rocks that have been carried by the flow of the river waear down the river bed.
3 - Attrition; Rocks that have been carried by the flow of the river smash together and break into smaller, smoother and rounder particles.
4 - Solution; Soluble particles are dissolved into the river water.
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