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Hurricanes - Lifecycle.  

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Hurricanes - Lifecycle Hurricanes are one of the most dangerous natural hazards to people and the environment. Every year immense damage is done by hurricanes and other similar tropical storms. However, hurricanes are essential features of the Earth's atmosphere, as they transfer heat and energy between the equator and the cooler regions towards the poles. What is a hurricane? A hurricane is a large rotating storm centred around an area of very low pressure with strong winds blowing at an average speed in excess of 74 miles per hour. The whole storm system may be up to 10 miles high and on averag 500 miles wide. It moves forward like an immense spinning top, at speeds up to 20 mph. How do hurricanes form? There are various trigger mechanisms required to transform frequent storms into rarer hurricanes. These trigger mechanisms depend on several conditions being 'right' at the same time. The most influential factors...

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