True: Light rains often evaporate in the dry air, never reaching the ground., Rainstorms sometimes come as violent cloudbursts and may bring as much as 25cm of rain in a single hour, With little vegetation to block it, the wind can carry sand and dust across entire continents and even oceans., Seasonal variations mean that temperatures can reach 50oC in summer and 0OC in winter, Heat radiates out at night making temperatures very cold, Some deserts are hyper-arid with an aridity index <0.03, False: Humidity is nearly 100% in most deserts, Winds at speeds of about 160 miles per hour can sweep through some deserts., Low diurnal variations, 0oC to 50oC largely due to the low levels of insolation, The low-pressure system of warm descending air stops clouds from forming, The aridity index is the ratio of Precipitation (P): Transpiration., Desert margins are even more hot than central deserts,

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