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Water Science For Schools: Sinkholes
Introduction to sinkholes, a geological occurrence "common where the rock below the land surface is limestone, carbonate rock, salt beds, or rocks that can naturally be dissolved by ground water circulating through them. As the rock dissolves, spaces and caverns develop underground." Features a map showing areas of the U.S. prone to sinkholes, and diagrams of types of sinkholes. From the U.S. Geological Survey (USGS).
http://ga.water.usgs.gov/edu/sinkholes.html
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