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Sunday, May 8, 2011

The World's Most Mysterious Places !




1. Lisbon, Portugal, Sinkhole


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"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.

2. Guatemala Sinkhole


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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 unpredictable.

3. Winter Park, Florida, Sinkhole


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"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. Mulberry, Florida, Sinkhole




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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.

5. Blue Hole, Belize


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If the sinkhole is near the sea—or in the sea, as with the famous Blue Hole in Lighthouse Reef off the coast of Belize—seawater can quickly seep in after a collapse, forming a deep pool.

6. Picher, Oklahoma, Sinkhole


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"It has happened in Missouri and in western Pennsylvania from coal mining," Missouri State's Gouzie said. "We've gotten better with buidlng mines so the roofs can support the weight over top of them."

7. Iceland Sinkhole


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8. Ik-Kil Cenote, Mexico


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9. Neversink Pit, Alabama


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Karst is the geologic term for landscapes formed mainly by the dissolving of limestone or dolomite bedrock. In the United States, karst underlies parts of Missouri, Arkansas, Kentucky, Tennessee, northern Alabama, Texas, and most of Florida. Such areas are marked by sinking streams, subterranean drainage, large springs, caves—and, of course, sinkholes.
Chetan Bhatt


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