JIM WEST / SCIENCE PHOTO LIBRARY JIM WEST / SCIENCE PHOTO LIBRARY
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Mesquite Flat Sand Dunes, Death Valley, Death Valley National Park, California, USA. At left, a visitor is hiking along the top of the dunes, which reach a height of around 30 metres. Death Valley, descending to 86 metres below sea level, is about 220 kilometres long and 25 kilometres wide. It has a hot arid climate, and temperatures can exceed 50 degrees Celsius. Photographed in January.
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