sea cave
Karst caves on land are mainly the result of chemical dissolution. For example, water will dissolve limestone and form caves. However, sea caves are not formed by chemical action, but by mechanical erosion. Generally speaking, it is the impact of water that destroys the structure of rocks. The hardness of different parts of the rock is different, and there are large and small cracks. The seawater will rush into the cracks in the rocks, and those fragile parts will collapse and break under the impact of the waves. This will form a depression in the rock wall and then form a hole. These holes are getting deeper and bigger under the constant impact of waves for thousands of years. The waves rushing into the cave will form great pressure and continue to destroy the rocks in the cave. Sometimes, the rock at the top of the cave will be washed away, forming another hole. At this time, the seawater rushes into the hole below, and the huge water pressure will be released from another hole in the form of jet water. In addition to this marine erosion, marine geological processes also include transportation and deposition. The various coastal landforms we see are actually the result of these geological processes. This effect is mainly caused by waves, tides, ocean currents and turbidity currents, and these four kinds of seawater movements are the mechanical power of marine geological processes. Under the action of marine geology, the coast will not only form sea caves, but also create other peculiar landscapes, such as sea domes, beaches, sea mushrooms and so on.