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A tornado violent rotating column of air extending from a thunderstorm to the ground. The most violent tornadoes are capable of tremendous destruction with wind speeds of 300mph.
A tsunami is a series of ocean waves caused by underwater earthquake ,landslide,or a volcanic eruption. More rarely ,a tsunami can be generated by a giant meteor impact with the ocean.
A flood is a submerging of normally dry land by an overflow of water.Depending on their type ,floods can develop very slow over time after extensive rains or over a few minutes, very quickly ,without any sign of rain.
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