Local residents look at a sinkhole near Qingquan primary school in Dachegnqiao town of Ningxiang, Hunan province June 15, 2010. The hole, 150 meters (492 feet) wide and 50 meters (164 feet) deep, has been growing since it first appeared in January and has destroyed 20 houses so far. No causalities has been reported and the reason for the appearance of the hole remains unclear, local media reported. (Photo by Reuters/Stringer)
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