Rates of erosion by attrition are affected by the rocks shape, lithology, and the energy of impact, therefore, softer rocks are more susceptible to attrition erosion. As attrition and breakage occur on a bedrock it becomes suspended: down-stream of a river or waterway the bedload increases due to attrition.
Rates of erosion by abrasion are influenced by the rock's form, composition, and the force of collision, thus, softer rocks are more prone to abrasion erosion. As abrasion and fragmentation take place on a bedrock, it becomes suspended: downstream of a river or waterway, the load increases due to abrasion.