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algodones arabia arizona arroyo atacama basin blow blowing classification climate curve curves curving dehydration desert desertion desolate dry dune dunes freedom gobi grain great gypsum habitat hamada hills hot irrigation isolated landscape laterite libya lonely lost mojave move movement moving natural open peak phoenix precipitation rain region sahara sand sensual shadow sky smooth soft spring stark sweat sweeping syria texture thar trek tucson urban wadi water wind windswept yuma windy