What caused the Sahara to become
Reading
Read the text and answer the multiple-choice question by selecting the correct response. Only one is correct.
Passage
The Sahara was not always a desert. Thousands of years ago, it was a green landscape dotted with lakes and home to a variety of wildlife. A gradual shift in the Earth's orbit altered rainfall patterns, slowly transforming the region into the vast desert we know today.
What caused the Sahara to become a desert?
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