Researchers are baffled by a fiery pit which recently appeared on the side of a Chinese mountain. The glowing orange hole has a recorded temperature of 792 Celsius (1458 Fahrenheit). According to geologist Hu Tan, the air pouring out of the hole is so intensely hot that it can cause a branch held near it to burst into flames. Experts believe it was caused by the the spontaneous combustion of coal.
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