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The Sahara. rock-strewn plateaus (hammadas); abrupt mountains; and sand
sheets, dunes, and sand seas (ergs). The highest point in the desert is the 11,204
-foot (3,415-metre) summit of Mount Koussi in the Tibesti Mountains in Chad; the
The Sahara was established as a climatic desert approximately five million years
ago, during the Early Pliocene Epoch. Since the Pliocene, the Sahara has been
subject to short- to medium-term oscillations of drier and more humid conditions.
Among some groups, hunting and fishing were subordinated to nomadic
pastoralism, after domesticated livestock appeared in the Sahara almost 7,000
years ago. The cattle-herding groups of the Tenere region of Niger are believed
to have ...
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