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A fault line is a fracture in the rock of the earth's crust where the plates intersect.

"Because of friction and the rigidity of the rock, the rocks cannot simply glide or flow past each other. Rather, stress builds up in rocks and when it reaches a level that exceeds the strain threshold, the accumulated potential energy is dissipated by the release of strain, which is focused into a plane along which relative motion is accommodated-the fault."

When that happens, you get an earthquake.

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13y ago
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Q: Why does most earthquake occur on fault lines?
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