ROGER HILL / SCIENCE PHOTO LIBRARY ROGER HILL / SCIENCE PHOTO LIBRARY
Tornado. 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 on 26 June 2012 in Saskatchewan, Canada.
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