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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.
How Deserts are Formed. Deserts are formed when rain clouds run into wind or mountains and drop rain in one area, leaving the land further away dry. Deserts that form near bodies of water are usually caused by winds. For example, the Sahara desert, near the Mediterranean. Deserts near mountains are formed when rain clouds drop their rain on one side, and the land on the other side of the mountains stays dry.