The impact of ground, which is caused by a sudden movement of the crust of the earth as heat energy in the world, powerful force stress stress is a collection of the world's working, broken stone.and the sudden movement of the slide is the main cause of this, but there will be an earthquake an earthquake from natural phenomena, but also a phenomenon that is caused by human beingsand to encourage them, but there will be less than the violence that occur naturally an earthquake may be a result of the volcanic explosion or bomb the trial mining underground nuclear bombs, etc.
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