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What causes earthquakes?

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What causes earthquakes? Earthquakes are evidence of movement of the tectonic plates that carry the continents. Most of the areas where earthquakes take place are along the edges of plates. Friction holds the plate edges together for a while, but continuing movement means that huge stresses build up.

The tension is suddenly released when the plates shift sharply, but these causes an earthquake here are other causes of earthquakes, but they all involve sudden movement of the crust along a fault or crack. The energy released in an earthquake is enormous - as much as 10,000 times the power released by the world's first atomic bomb.

The geological record and fossils show how parts of the Earth's surface that are now widely separated were once locked together in a super-continent. The theory of continental drift explains why animals such as marsupials, for instance, live in both South America and Australia.


Tags: tectonic plates, earth



Category: Education  - ( Education Archive)

Date Added: 12 December '11


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