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发帖数: 1994 | 1 Terkezi Oasis in the Sahara Desert
Credit: Landsat 7, NASA
Explanation: Dominating the top third of Africa is the largest band of dry land on Earth: the
Sahara Desert. Stretching across the Sahara are vast plains of sand and gravel, seas of sand
dunes, and barren rocky mountains. Only 10,000 years ago, however, grasses covered the
region, then rich in mammals such as lions and elephants. Now only two percent of the
Sahara are oases, patches of land where crops will grow an |
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