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What causes an earthquake?
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When two of the Earth's plates move against each other, pressure builds up along the boundary. Often the plates are locked together, unable to move as the pressure increases. Eventually the stress is so great that the crust ruptures, the rock masses jump past one another, and shock waves spread out in a destructive burst of energy. The result is an earthquake. | | An earthquake is most violent at its epicentre, the point on the surface directly above the source. |
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Previous:
Back
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Book:
1001
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Section:
Earth
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Chapter:
Natural Disasters
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