- This is the wearing away of the bed and banks in a river
Abrasion/Corrasion: Rock fragments carried by river wear down bed and banks of channel. Boulders scrape rock bed while sand and gravel smooth surfaces
Hydraulic Action: Sheer force of water on the bed and banks. Water pushes into cracks of bed causing pressure and then erosion
Corrosion/Solution: Dissolving of soluble materials in bed and banks by weak acids in river water. Chemical reaction so not dependant on energy
Attrition: Load particles coming into contact with each other as well as the bed and banks. Rough edges become smoothed and particles become smaller and more rounded
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