There were more permanent human settlements in the central Sahara about 5,000 years ago than there are today.
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Q21: A petroglyph is a prehistoric rock carving.
Q22: Eolian erosion is the most important agent
Q23: The presence of an inselberg indicates that
Q24: Inselbergs are found in all climates, not
Q25: Sand dunes are found only in deserts.
Q27: The Green Sahara refers to a period
Q28: Sand dunes migrate in the direction that
Q29: Eolian erosion and deposition sorts particles by
Q30: Eolian means "of or relating to wind."
Q31: Mesa-and-butte terrain occurs only in deserts.
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