Johannesburg, Gauteng. The city centre is the fine-grained pattern (created by shadows cast from the high rise buildings in the city) in the middle of the image. The light angular patches are mine dumps, huge hills of crushed rock extracted from gold mines. The green zone above the city centre is the leafy northern suburbs. By contrast, the township of Soweto appears as the grey zone at lower left - largely treeless except for protected valley bottoms. Image copyright Nasa Multimedia
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