How did the geography and climate of the Sahara change over a long period of time ?

How did the climate of the Sahara Desert change over time?

New study finds that the world's largest desert grew by 10 percent since 1920, due in part to climate change. Summary: The Sahara Desert has expanded by about 10 percent since 1920, according to a new study.

Explanation:

the answer is a) to be able to obey them.

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