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How the Sahara Was Born

How the Sahara Was Born

The Sahara is the ’s largest and most legendary subtropical , but knowledge about it is limited. Even estimates of when it formed vary widely, from more than five million years ago to mere thousands. Now, however, geologists studying wind-carried Saharan dust on the Canary Islands come closer to pinning this down: it is, they report, close to five million years old.