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A hurricane is a circular air movement over the warm ocean waters in the warm part of Earth near the equator. Most tropical cyclones create strong winds and heavy rains. While some tropical cyclones stay out in the sea, others pass over land. This can be dangerous because they can cause a lot of damage.

Tropical cyclones form when warm, moist ocean air rises. They begin as a group of storm winds when the water gets as hot as 80 °F (27 °C) or hotter. The Coriolis effect causes the winds to rotate. They usually move westward in the tropics, and later move north or south into the temperate zone.