Question

sea caves are turn into stacks

Answer 1

Sea caves are turned into stacks (wall like features) because erosion breaks the roof of the caves and only walls are left (iv)Earthquakes are sudden movements of the earth which cause mass destruction.

Answer 2

Answer:

Sea waves continuously strike at the rocks. Cracks develop. Over time they become larger and wider. Thus, hollow like caves are formed on the rocks. They are called sea caves. As these cavities become bigger and bigger only the roof of the caves remain, thus forming sea arches. Further, erosion breaks the roof and only walls are left. These walls like features are called stacks.