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Message: <blockquote data-quote="Thilina weerakkody" data-source="post: 10563836" data-attributes="member: 323658">comments pleaseNature never stops to amaze us with its magnificent phenomenon just like these inexplicable holes in the ground. I bet that these holes make an excellent tourist attraction1-<img src="http://www.chilloutpoint.com/images/2010/12/world-famous-pits/world-famous-pits-09.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />A parked bus was the unfortunate “meal” of a sinkhole that opened up in the streets of Lisbon, Portugal, in 2003.“Anything that increases the flow of water into subsurface soil can speed up the formation of sinkholes’” ,Missouri State’s Gouzie said. In many cities, utility infrastructure such as sewer lines and fiber optic cables are buried in troughs filled with loose material, which can wash away over time. In some cases, a stretch of road can essentially become a concrete bridge over mostly empty space.“It’s eventually not enough to hold the weight of the next truck over it,” Gouzie said.2-<img src="http://www.chilloutpoint.com/images/2010/12/world-famous-pits/world-famous-pits-01.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /><img src="http://www.chilloutpoint.com/images/2010/12/world-famous-pits/world-famous-pits-02.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />Heavy rains from tropical storm Agatha likely triggered the collapse of a huge sinkhole in Guatemala on Sunday, seen above a few days afterward.In the strictly geologic use of the word, a sinkhole happens when water erodes solid bedrock, carving an underground cavity that can then collapse. Many parts of the United States are at risk for that type of event.The Guatemala sinkhole fits into a broader use of the term, which refers to any sudden slump of the ground’s surface. Instead of solid bedrock, much of Guatemala City rests atop a layer of loose, gravelly volcanic pumice that is hundreds of feet thick. And at least one geologist says leaking pipes—not nature—created the recent sinkhole.Overall, the risk for repeat sinkholes in Guatemala City is high—but highly unpredictabl3-<img src="http://www.chilloutpoint.com/images/2010/12/world-famous-pits/world-famous-pits-03.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />he sinkhole in Winter Park, Florida (map), opened up in 1981 underneath the city’s public swimming pool, Missouri State’s Gouzie said.“I’ve never seen a final report as to whether the pool was leaking,” he said, adding that water can flow into the underlying soil through tiny cracks in the bottom of a pool. Even watering plants at the pool’s perimeter could have sent enough runoff through Florida’s sandy soil to erode the solid limestone underneath.Gouzie said the U.S. Geological Survey has mapped the types of bedrock that exist across the country. But studies of the underground cracks and fissures—and the way water travels through them—are still needed to predict where sinkholes could occur.4-<img src="http://www.chilloutpoint.com/images/2010/12/world-famous-pits/world-famous-pits-04.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" />This 185-foot-deep (56-meter-deep) sinkhole appeared in 1994 in Mulberry, Florida (map), in a pile of waste material dumped by mining company IMC-Agrico. The company was mining rock to extract phosphate, a main ingredient in fertilizers and a chemical used to produce phosphoric acid, added to enhance the taste of soda and various food items.After phosphate was extracted from the rocks, the gypsum-based waste product was dumped as a slurry. As layer after layer of the stuff dried, it formed cracks, like those that appear in dried mud. Water later made its way through the cracks and carried away subsurface material, setting the stage for a sinkhole</blockquote>

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