avalanche  - a large amount of ice, snow, and rock falling quickly down the side of a mountain, drought - a long period when there is little or no rain, earthquake - a sudden violent movement of the earth's surface, sometimes causing great damage, epidemic - the appearance of a particular disease in a large number of people at the same time, famine - a situation in which there is not enough food for a great number of people, causing illness and death, or a particular period when this happens, flood - to cause to fill or become covered with water, especially in a way that causes problems, forest fire - a fire that is burning strongly and out of control on an area of grass or bushes in the countryside, mudslide - a mass of mud (= wet earth) moving suddenly and quickly down a steep slope, tornado - a strong, dangerous wind that forms itself into an upside-down spinning cone and is able to destroy buildings as it moves across the ground, tsunami - an extremely large wave caused by a violent movement of the earth under the sea, volcanic eruption - an occasion when a volcano explodes, and flames and rocks come out of it; (of a volcano) the act of doing this,

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