A Florida man is presumed dead after his bedroom was swallowed by a sinkhole last night. This terrifying scenario is more common than you think. Sinkholes occur when bedrock made of limestone or other carbonate rock is eaten away by acidic groundwater or a surge of pressure caused by heavy rains or burst pipes. They occur, sometimes suddenly,all over the U.S. as well as elsewhere in the world where the bedrock is susceptible - notably in China, M ...
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