Breakdown: Sinkholes, why the bottom can fall out at any time - WMC

Erosion can occur on the surface or below the surface (subsurface). Sinkholes are rare but happen in areas where the most common rock below the land surface is limestone, carbonate rock, salt beds, or rocks. These are rocks that can naturally be dissolved by groundwater circulating through them. These rock types are known as evaporites. Evaporite rocks underlie about 35 to 40 percent of the United States, according to experts, in many areas they are buried at great depths.

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Breakdown: Sinkholes, why the bottom can fall out at any time - WMC
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