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What are the prevailing winds?
The winds are described as prevailing because they always blow in the same pattern. This happens because of two effects: convection, in which hot air rises and cool air flows in to take its place, combined with the Earth's rotation. There are always winds blowing toward the Equator, and others that blow away from the tropics.
The winds that blow outward from the poles are diverted to east and west by the Earth's rotation.
The winds that blow outward from the poles are diverted to east and west by the Earth's rotation.
 
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Weather and Climate