Students should read about North Africa when the Sahara was green with grasslands and forests along the plenteous streams and shallow lakes now dry wadis and salt pans, back in the days when cattle, elephants, giraffes, and hippos lived where today is one of the driest places on earth, to consider how much rain fell annually in those days for that bounteous vegetation and wildlife, as much as falls on the pampas of Argentina, about 30 inches annually, during the Ice Age much more cloud cover worldwide.
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