What causes earthquakes? *

Earthquakes are usually caused when rock underground suddenly breaks along a fault. This sudden release of energy causes the seismic waves that make the ground shake.This is also because the rocks are still pushing against each other, but not moving. After a while, the rocks break because of all the pressure that's built up.

Explanation:

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the only other powers were germany russia and uk and they were too busy fighting each other wearing each other down   that the us was becoming strong and they were becoming weaker

answerpeople organize large projects such as levee-building;