Which of the following is NOT a main process of coastal erosion?

Deposition is the process that involves the accumulation or laying down of material, such as sand, pebbles, and sediment, which is contrary to the processes of coastal erosion that focus on the removal and wearing away of materials. The main processes of coastal erosion include hydraulic action, where waves exert pressure on the coastline and undercut the rock, attrition, which involves the collision and wearing down of rocks and sediments against each other, and solution, where chemical processes dissolve soluble rocks like limestone. Therefore, while deposition is a crucial process in the coastal system, it does not contribute to erosion; rather, it is more associated with the subsequent movement of materials in a coastal environment.