Hurricanes.
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What are Hurricanes? Hurricanes are violent tropical storms, an atmospheric movement in which the wind blows spirally round towards a centre of low barometric pressure. They are characterised by very strong winds and torrential rains. Hurricanes kill more than 20,000 people a year. Worldwide, that is more than any other form of natural disaster. A large hurricane can release more energy in one day than all the energy used in a year by the USA. How are they formed? Hurricanes develop in tropical areas, over the sea. The sun's rays heat the air and water, which are more concentrated at or near the equator. The hot air rises up, carrying with it large amounts of water in the form of fine droplets (water vapour). The warm air spirals upwards, leaving an area of calm in the centre, called the 'eye of the storm.' This 'eye' can be dangerous because as it passes...


