what are tornadoes ?
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A tornado is defined as a strong rotating air column with vertical axis, which must have contact to the ground. In most cases a tornado is visible as a funnel cloud. ... The lifetime of a tornado is from a few seconds to more than half an hour; in very rare cases a tornado can also last over one hour
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- A tornado is a rapidly rotating column of air that is in contact with both the surface of the Earth and a cumulonimbus cloud or, in rare cases, the base of a cumulus cloud.
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