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Water Science For Schools: Sinkholes URL: http://ga.water.usgs.gov/edu/sinkholes.html Description: 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). LII Topics: Geology, Sinkholes Publisher: U.S. Geological Survey (USGS) Extra Keywords karst Library of Congress Subject Headings: Geology -- United States -- Maps Sinkholes LII Database Information: Record 21306 created by Jennifer English on 04/24/2006 Last modification on 04/25/2006 Published: 04/27/2006 Funding agency: California State Library LII Item ID: http://lii.org/cs/lii/view/item/21306 |
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