How deep is the sand of the Sahara? What is below it? Is it a gradual transition, or ...?

The Sahara, Arabic for desert, stretches across North Africa. The Sahara is the world's largest non-polar desert, over 9,000,000 km² (3,500,000 mi²), which is about the same size as the United S…   Top stories for {NAME} [Quora](   [How deep is the sand of the Sahara? What is below it? Is it a gradual transition, or is it like pure sand dumped directly on some previous flat surface?]( John Flavin, Professional Geologist and Engineer • [Updated March 5, 2019]( [The Sahara, Arabic for desert, stretches across North Africa. The Sahara is the world's largest non-polar desert, over 9,000,000 km² (3,500,000 mi²), which is about the sam... 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