Sand covers only something like 20 percent of the Earth's deserts. Most of the sand is in sand sheets and sand seas--vast regions of rising and falling dunes resembling ocean breakers "frozen" in an instant of time.
Nearly 50 percent of desert surfaces are plains where on earth eolian deflation--removal of fine-grained material by the wind--has exposed loose gravels consisting predominantly of pebbles but beside occasional cobbles.
False. It covers about 20% of most deserts
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