what caused the sahara to become a desert
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what caused the sahara to become a desert, how did the sahara desert form, how sahara became a desert, what made the sahara desert, what created the sahara desert, how was the sahara desert formed, why does the sahara desert exist, what happened to the sahara desert, why did sahara desert change, why is the sahara desert increasing, origin of the sahara desert, formation of sahara desert