Sea caves are turned into stacks and buildings collapse due to earthquakes. Give reasons.
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Answer:
(iv)Buildings collapse due to earthquakes.. Answer: ... (iii)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:
Stacks are formed as a result of the erosional activity of the sea waves. When sea waves continuously strike rocks, cracks develop in them. As these cracks become larger and wider, hollow caves get formed on the rocks. These are called sea caves. As the waves keep striking the rocks, the cavities become bigger and bigger, with only the roof remaining at the end. Such structures are known as sea arches. Further erosion breaks the roof, and only walls remain. These wall-like features are known as stacks. Thus, sea caves are ultimately converted into stacks.
Earthquakes are the sudden vibrations caused within the earth’s surface as a result of the movement of the lithospheric plates. Such vibrations can travel all round the earth. When they are of a high intensity, they cause damage to the things on the earth’s surface. Various human-made (e.g., buildings) and natural (e.g., trees) constructions can break down and collapse under the effect of the vibrations because they are situated on the Earth’s surface.The greatest damage usually happens closest to the epicentre and the strength of the earthquake decreases away from the centre. Although earthquakes cannot be predicted, the impact can certainly be minimised if we are prepared before hand.