earthquake - a sudden, violent shaking of the earth's surface , hurricane - a violent storm with extremely strong winds and heavy rain, volcanic eruption - a sudden explosion when burning rocks, ash and lava are thrown out from a volcano , wildfire - a fire that starts in an area of a countryside and spreads very quickly , drought - a long period of time when there is little or no rain and crops die, landslide - a large mass of rocks and earth that suddenly and quickly moves down the side of a mountain or hill , avalanche - a large amount of snow and ice that suddenly falls down a mountain, tsunami - an extremely large wave caused by a violent movement of the earth under the sea , tornado - a very strong wind that goes quickly round in a circle or funnel, flood - a large amount of water covering an area of land that is usually dry,

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