A crater is spotted in a construction site on a slope in Xishan in Urumqi, China's Xinjiang Uygur Autonomous Region, on April 7, 2015. The crater is 150 centimetres long in diameter. The crater is glowing red with heat waves. The temperature is measured at 792 degrees Celsius. Experts conclude that the crater was created by a natural collapse of an underground coal bed. [Photo: CRI Online]
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