Author Topic: karst terrain sinkholes  (Read 421 times)

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Plane

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karst terrain sinkholes
« on: March 17, 2013, 01:41:13 PM »
http://www.usgs.gov/blogs/features/usgs_top_story/the-science-of-sinkholes/


Around 20% of the U.S. lies in areas susceptible to sinkhole events.