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Saturday, April 20, 2013

Video: ✔What's Inside A Sinkhole?





✔What's Inside A Sinkhole?
SOURCE...
http://www.cnn.com/video/


A sinkhole, also known as a sink, snake hole, swallow hole, swallet, or doline, is a natural depression or hole in the Earth's surface caused by karst processes—for example, the chemical dissolution of carbonate rocks or suffosion processes in sandstone. Sinkholes may vary in size from 1 to 600 metres (3.3 to 2,000 ft) both in diameter and depth, and vary in form from soil-lined bowls to bedrock-edged chasms. Sinkholes may be formed gradually or suddenly, and are found worldwide. The different terms for sinkholes are often used interchangeably.

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