Corrasion is a geographical term best used to describe the wearing away of small/fine particles of rock on a river/seabed by a sandpapering action called abrasion, and it collapses to form a dip in the bed. This sometimes happens at the bottom of cliffs to a slanted edge. Other forms of sea erosion include Hydraulic Action (the force/power of the seawater) and attrition. Can refer to stream erosion and transport. Corrasion involves wearing away surfaces that the water flows over through the im… (More on Corrasion)