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Geology -- United States -- Maps Geology Topics: Sinkholes 
 Documents and data about sinkholes, "one of many kinds of karst landforms, which include caves, disappearing streams, springs, and underground drainage systems. ... Karst is a generic term which refers to the characteristic terrain produced by erosional processes associated with the chemical weathering and dissolution of limestone or dolomite." Provides a FAQ, and a poster showing Florida's sinkholes and diagrams of sinkhole formation. Some material specific to Florida. From the Florida Geological Survey. http://www.dep.state.fl.us/geology/geologictopics/sinkhole.htm Topics: Geology Last updated Apr 25, 2006 A Tapestry of Time and Terrain: The Union of Two Maps - Geology and Topography
Information about the topography and geology of the continental United States. A digital map contains the description for each geologic feature with information for the eras in which it was formed. "Rock of Ages" is a timeline of each geologic era linked to the regions of the map. "Boundaries" shows two more maps: one with geomorphic, or physiographic, regions; the other with state boundaries. From the U.S. Geological Survey (USGS). http://tapestry.usgs.gov/default.html Topics: Geology, Outdoor Recreation, Scientific Themes, U.S. Maps Last updated Aug 23, 2005 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 Topics: Geology Last updated Apr 25, 2006 |
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