500
A tornado is a violently 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. They are often referred to as twisters or cyclones, although the word cyclone is used in meteorology, in a wider sense, to name any closed low pressure circulation.
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Tornadoes, also called cyclones or twisters, are columns of air that rotate while in contact with both a cumulonimbus cloud and the earth's surface. The air column may also be in contact with a cumulus cloud's base, in rare cases.
What is no.
This is word-switch plagiarism and not paraphrasing. All the same words are used, but are in a different order.