Africa is essentially a huge plateau divided naturally into two sections. Northern Africa, a culturally and historically Mediterranean region, includes the Sahara desert—the world's largest expanse of desert, coming close to the size of the United States. Sub-Saharan, or Black Africa, also contains some desert land, but is mainly tropical, with rain forests clustered around the equator; vast savanna grasslands covering more than 30 percent of continent and surrounding the rain forests on the north…
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