Science Features » caves http://www.usgs.gov/blogs/features Highlighted USGS science Mon, 20 May 2013 15:32:21 +0000 en-US hourly 1 http://wordpress.org/?v=3.4.2 Caves, Sinkholes and Springs http://www.usgs.gov/blogs/features/usgs_top_story/caves-sinkholes-and-springs/ http://www.usgs.gov/blogs/features/usgs_top_story/caves-sinkholes-and-springs/#comments Tue, 15 Mar 2011 15:00:33 +0000 ocweb http://www.usgs.gov/blogs/features/?p=92744 Collage of soluble rock layers of Karst.

Soluble rock layers called “Karst” exist throughout the nation. While Karst aquifers produce half the nation’s drinking water, rock layers underneath karst dissolve easily sometimes creating sinkholes that threaten life and property. Join us May 4th to learn more about this unseen world beneath our feet.

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]]> http://www.usgs.gov/blogs/features/usgs_top_story/caves-sinkholes-and-springs/feed/ 0 karst_collage Collage of soluble rock layers of Karst.