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what is cyclone?

A cyclone is a huge revolving storm caused by very high speed winds blowing around a central area of very low pressure in the atmosphere. A cyclone is formed over warm sea-water and it is about 10 to 15 kilometres high. A cyclone revolves due to the force exerted by the rotation of earth. The centre of a cyclone is a calm area . The centre of cyclone is called ' eye' of the cyclone. Factors like temperature, humidity, wind speed, wind direction and rotation of earth, contribute to the development of a cyclone.