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An earthquake is caused by the sudden release of

  • A.stored elastic strain energy in the rock
  • B.heat generated by radioactive decay in the crust
  • C.gas trapped beneath the surface of the earth
  • D.water pressure built up in deep aquifers

Answer: A

Tectonic movement loads the rock elastically until its strength is exceeded, at which point it ruptures and the stored strain energy is released as seismic waves and heat. That is why earthquakes recur on the same faults as strain accumulates again.

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