Africa is the world's second most populous continent (after Asia), with 922 million people, or 14.2% of the total. The earliest ancestors of humans are widely thought to have originated in the African continent.
A wide variety of climates and topographical features exist in Africa. The climate can be freezing on Africa's high mountains, tropical in the rainforest and coastal areas, and temperate in other areas. North Africa is primarily desert, while the southern part of Africa is mostly rainforest and savannah plains.
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