Answer: Abrasion
Abrasion occurs when particles of sediment in flowing water scrape against the streambed.
Explanation:
Abrasion refers to a process which occurs when waves break on the shore which results in water, stones and energy of the waves causing erosion. It is caused as a result of scuffing, scratching, wearing down, marring, and rubbing away of materials. It’s intensity rest on the hardness, velocity, mass and concentration of the moving particles or materials.