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Sinkholes. Created By: Marcous Phillips. What is a sinkhole. A sinkhole is a depression in the ground that has no natural external surface drainage . Water drains to the subsurface. Causes of sinkholes. Underneath soil/rock is dissolved by groundwater flowing through the material.
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Sinkholes Created By: Marcous Phillips
What is a sinkhole • A sinkhole is a depression in the ground that has no natural external surface drainage. • Water drains to the subsurface
Causes of sinkholes • Underneath soil/rock is dissolved by groundwater flowing through the material. • Human involvement
Factors in sinkholes • Aquifer systems • The soil above the system is balanced by the water pressure in the aquifer. When water is removed from system it destabilizes the pressure, increasing the chance of a sinkhole forming • Higher chance in urban
Factors in sinkholes • Karst Terrain • landscape formed from the dissolution of soluble rocks like limestone and gypsum. • characterized by sinkholes, caves, and underground drainage systems
Types of Sinkholes • Dissolution sinkholes • ground with little overburden • Water erodes the rock away • deep impression in the ground forming a basin
Types of Sinkholes • Cover-collapse sinkhole • Water erodes rock away underneath overburden • Overburden soil loses stability • Rapid and sudden collapse • Can take weeks or years to reach point of collapse
Types of Sinkholes • Human involvement • Leaky pipes • Sewer leakage • Pumping of groundwater • Construction • Water diversion • These are majors in formation of a sinkhole
Most Effected Areas Florida, Texas, Alabama, Missouri, Kentucky, Tennessee, and Pennsylvania are most prone.
Prevention of Sinkholes • Natural Sinkholes are very hard to prevent • Human made sinkholes can be avoidable • Proper construction and maintenance of any underground pipes • Proper groundwater usage • Helps keep water table high and supports overburden • When a sinkhole occurs make sure it is kept trash free • Sinkholes usually have a direct link to drinking water which trash thrown into the sinkhole can lead to pollution of drinking water
Famous Sinkholes • Guatemala City’s Sinkholes, Guatemala • Happened in 2007, 300 ft. down
Famous Sinkholes • Devil’s Sinkhole, Texas, U.S.A. • 40 ft. by 60 ft. opening , 400 ft. down
Sources • http://water.usgs.gov/edu/sinkholes.html • http://science.howstuffworks.com/nature/natural-disasters/sinkhole.htm • http://www.esi.utexas.edu/outreach/caves/karst.php • http://amr.edwardsaquifer.org/display_education_portal_m.php?pg=education_how_does_the_aquifer_work • www.geocaching.com • http://www.sjrwmd.com/watersupply/howsinkholesform.html • http://www.therichest.com/expensive-lifestyle/location/the-top-10-most-amazing-sinkholes-on-earth/