When Climatic Change Began to Create the Sahara Desert as We

question 31

Multiple Choice

When climatic change began to create the Sahara Desert as we know it today,

• A) farmers moved south into the Niger River valley where they could continue familiar ways.
• B) Saharan herders migrated eastward, where they found lands conducive to their way of life.
• C) many of the pastoral herders became nomadic, using the scant resources of the desert to eke out a living.
• D) agriculture spread south into the rain forests, where cereals began to be grown for the first time.
• E) the cultivation of millet and rice was carried into both the Niger and Nile River valleys by those forced to migrate.

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An estimate that gives a range within which future observations will fall, with a specified probability.

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