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Tornado moving over rural land creating a large debris cloud. A tornado is a violent rotating column of air characterised by a funnel-shaped cloud that forms within thunderstorms. They can measure up to 100 metres in diameter, contain winds moving at over 500 kilometres an hour, and cause widespread devastation. Tornadoes are most common in the mid-west USA. Photographed in Kansas, USA. (KEYSTONE/SCIENCE PHOTO LIBRARY/JIM REED) === ===