It is a frightening thought to picture the ground below your feet or house suddenly falling down and developing a big opening in the ground. Sinkholes hardly ever happen, yet when they strike, disaster can occur. Sinkholes happen when the ground below the land surface area can not sustain the land surface. Water Science School HOME Groundwater topics. Sinkholes are common where the rock below the land surface is sedimentary rock, carbonate rock, salt beds, or rocks that can normally be liquified by groundwater circulating through them. Because the land usually stays intact for a while till the underground areas just get too huge, sinkholes are remarkable. If there is not sufficient assistance for the land over the spaces, then unexpected collapse of the land surface area can occur. A sinkhole is an area of ground that has no all-natural external surface water drainage-- when it rains, the water remains inside the sinkhole and normally drains into the subsurface. Sinkholes can vary from a couple of feet to thousands of acres and from less than 1 to more than 100 feet deep.
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