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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.
Section 3 Air Movement and Wind Key Concept Global winds and local winds are produced by the uneven heating of Earthâs surface. What You Will Learn â¢ Uneven heating of Earthâs surface by the sun causes differences in air pressure that cause wind. â¢ Wind patterns can be global or local and are influenced by the rotation of Earth and by geography. Why It Matters