"Florida is made out of limestone. There's a lot of groundwater that goes through the limestone and can erode the limestone away. As the water table rises and falls, sometimes those voids in the limestone can't support the weight that is on top of them, and they cave in," Puz said, adding that there are numerous other scenarios that can cause sinkholes.
Some sinkholes form depressions in the ground first; some collapse immediately. In this family's case, Puz said, "it happened very quickly," but officials don't know what processes were happening underground, and for how long, before the sinkhole ripped open their home.
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