Final answer:
Deserts are arid regions with low rainfall, extreme temperatures, and sparse vegetation.
Explanation:
Deserts are dry areas where evaporation usually exceeds precipitation. Rainfall is low, less than 25 centimeters per year, leading to temperature extremes and little vegetation. Deserts can be hot (e.g., the Sonoran) or cold (e.g., the Gobi), with sand, gravel, or rocks making up the substrate.
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