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Wind is air in motion. Wind forms when the sun heats one part of the atmosphere differently than another part. This causes expansion of warmer air, making less pressure where it is warm than where it is cooler.
Global and Local Winds, Page 1. Wind is the horizontal movement of air. All wind is caused by. the uneven heating of Earthâs surface, which sets convection. currents in motion. Convection currents on a large scale cause. global winds; convection currents on a small scale cause local winds.