Sea caves are formed in coastal areas. Select the suitable reason for…

Concept: Coastal landforms such as sea caves, arches, and stacks are shaped by marine (wave) erosion. Breaking waves attack a rocky coastline through hydraulic action (the sheer pounding force and compressed air of water hitting the rock) and abrasion (rock fragments carried by the water grinding against the cliff face), wearing away weaker lines such as joints and cracks over long periods.

Application: Along a rocky coast, waves repeatedly strike a line of weakness in a cliff. Sustained hydraulic action and abrasion hollow out that weak zone, while some of the eroded rock debris is deposited nearby by the same wave action. Over time this progressively widens and deepens the opening into a sea cave.

Why the other options don't fit:

• Wind erosion shapes arid/desert landforms (such as mushroom rocks or dunes) through wind-blown sand and dust; it does not act at the water-rock interface along a coastline, so it cannot carve a coastal cave.

• Sea caves are a natural geomorphological feature produced by ongoing geological processes, not something built or caused by human construction.

• Falling of rocks (rockfall) is a gravity-driven mass-wasting process that may occur once a cave has already been weakened, but it is not the process that initially sculpts the cave along the coast.

Hence, erosion and deposition by ocean waves is the process responsible for the formation of sea caves.