Sinkholes are particularly abundant in places with Karst terrain, where the rock below the land surface is soft, eroding over time and eventually giving way, creating these deep underground caverns.
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A sinkhole may have swallowed a Pennsylvania woman. What are sinkholes and how do they form?Sinkholes are most common in what geologists call karst terrain, which involves types of rock including limestone below the land surface that can naturally be dissolved by groundwater circulating ...
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