Is sea arch erosion or deposition?

Sea arch formation is primarily a result of erosion, not deposition. Erosion is the process by which rock and sediment are removed from a landscape, typically by the action of wind, water, or ice. In the case of sea arches, the relentless force of waves crashing against coastal rock formations gradually wears away softer rock layers, leaving behind the iconic arch structure. Deposition, on the other hand, involves the laying down of sediment or rock particles in a new location, which is not the primary mechanism behind sea arch formation.