DR NEIL OVERY / SCIENCE PHOTO LIBRARY DR NEIL OVERY / SCIENCE PHOTO LIBRARY
Sinkhole at abandoned coal mine. Sinkhole at an abandoned coal mine near people living in a shanty town in Witbank, Mpumalanga, South Africa. Sink holes like this pose serious health and environmental risks. According to a European Union research team, the area around Witbank is said to have the most polluted air in the world.
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