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1. a sudden shaking of the earth's surface, which may cause great damage; --  earthquake
2. a very violent wind in the form of a tall wide pipe of air that spins at a great speed; -- tornado
3. a very high, quickly travelling sea wave caused by an undersea earthquake or similar disturbance; -- tsunami
4. a mountain with a crater at the top, through which lava, steam gases, etc. sometimes escape with explosive force; -- volcano
5. an overflow of water; a large amount of water covering a place that is usually dry; -- Flood
6. a long period of time when there is no rain and crops die. -- drought