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shaking and vibration at the surface of the earth resulting from underground movement along a fault plane or from volcanic activity
a severe tropical cyclone usually with heavy rains and winds moving a 73-136 knots (12 on the Beaufort scale)
make ready or suitable or equip in advance for a particular purpose or for some use, event, etc
a fissure in the earth's crust (or in the surface of some other planet) through which molten lava and gases erupt
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