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Sinkholes

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by

Aditya Mayya

on 26 March 2013

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Transcript of Sinkholes

Just recently in Seffner, Florida, a man's house was swallowed up while he was asleep. He is now presumed dead, as officials have said that going into the sinkhole is too dangerous. By Saswata Gupta / Henry Zhou / Aditya Mayya Sinkholes Where do sinkholes occur? How Have Sinkholes Affected Us? Karst areas:
Where there are lots of dissolved mineral
Has a high sinkhole creation chance What Forces Causes a Sinkhole to Form? Bibliography http://news.nationalgeographic.com/news/2013/03/130305-florida-sinkhole-science-causes-world/

http://www.sinkholes.com/sinkhole-types/

http://news.nationalgeographic.com/news/2010/06/100603-science-guatemala-sinkhole-2010-humans-caused/
http://news.nationalgeographic.com/news/2010/06/photogalleries/100604-sinkhole-pictures-around-the-world-guatemala-city/#/sinkholes-holes-ground-florida-depression_21286_600x450.jpg

http://allensaxiom.ednet.ns.ca/hist_oldies.htm

http://www.clker.com/clipart-ticking-clock-frame-2-1.html

http://www.carto.net/neumann/travelling/santorini_2004_05/01_sellada_old_thira_profitis_ilias_pirgos_2004_05_25/29_part_of_sewage_system_old_thira.jpg

http://www.dreamstime.com/royalty-free-stock-photography-concrete-drainage-pipes-construction-site-image7664047

http://www.illustrationsof.com/1087741-royalty-free-hole-clipart-illustration

http://www.clker.com/clipart-weather-storm-rain.html Places with a lot of limestone (a very soluble mineral) can be considered high karst areas. Because of this, literally the entire eastern board of North America (the major places being the state of Florida and the Great Appalachian Valley) can be considered a karst area and have a high chance of sinkhole creation. What Are Sinkholes A sinkhole is a collapsed feature in the ground. A natural depression or hole in the Earth. There are 3 main types of sinkholes Solution Sinkholes Cover Subsidence Sinkholes Cover Collapse Sinkholes This occurs when there is at the surface or a Cover Subsidence Sinkholes occur when the layer on top is permeable such as or limestone Thanks for watching this sinking presentation. thin layer of soil Rain or other downwards forces of water dissolve the and bring it down into the earth. This creates a downward movement of the surface downwards forces limestone Solution sinkholes are not very dangerous as it happens gradually clay sand clay sand The top layer of or seeps into the cracks in the , gradually breaking through that layer of . This is also gradual. limestone limestone Cover Collapse Sinkholes are the most dangerous They occurs when an empty space underneath the ground, usually an aquifer; is collapsed on top Since the top layer of the surface is usually hard, it is stable for a certain amount of time Eventually, the thin surface can no longer hold the objects on top of it and falls down, creating a sinkhole Sinkholes can be caused by human or natural activity. Neglected pipelines and sewage systems create water movement that can soften materials and cause the top of it to leach underground The same process occurs in a place with a high level of soluble minerals. Mexico Belize Slovenia, Croatia and Italy China Russia Surprisingly, Guatemala City is not a karst area and the sinkholes were due to faulty piping and rusty sewage systems in the town. The aftermath of the sinkholes caused people to accuse their municipal government for negligence and urge them to investigate. Guatemala City has been affected by two giant sinkholes in just a couple of years. The first happened in 2007 and the second in 2010,
Massive property damage was incurred, as well as questions about the municipal's government competence.
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