Desert and its Classification Desert is a biome in which evaporation exceeds precipitation. The rate of evaporation varies with temperature. Desert is likely to develop where the annual precipitation is less than 250 mm. It is important to remember that aridity (or the absence of moisture) is the common characteristic of all deserts, while temperature varies from desert to desert. Deserts may be classified into hot and dry deserts, semi deserts, coastal deserts and cold deserts, based on the amount and distribution of temperature and precipitation. Deserts in which sand is in abundance, completely covering the ground and leading to the formation of dunes that resemble wave-like ridges of the ocean surface, are called erg, meaning a sand sea. In other deserts, the wind may blow away all the sand, leaving behind closely packed, interlocking angular rock fragments. Such a stony desert is known as reg . In some deserts the landscape is dominated by boulders and exposed bed...
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