Peering down from outer space

Peering down from outer space at the rolling green landscape of south-western China's rural Chongqing Municipality, a series of deep, dark gashes appear, denting the land like an alien footprint. Some experts wonder whether these mysterious formations are the result of a meteorite crashing into the Earth. Others believe they gradually formed over some 128,000 years, as water seeping into underground rivers slowly carved the surrounding limestone rock on its journey.


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