DR NEIL OVERY / SCIENCE PHOTO LIBRARY DR NEIL OVERY / SCIENCE PHOTO LIBRARY
Sinkhole at abandoned coal mine. Sinkhole with underground coal still burning at an abandoned coal mine near 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.
Model release not required. Property release not required.