Nature 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 attraction. Check out these unreal photographs
and location descriptions of 9 of world’s most famous pits and sinkholes.
Check out too these related articles that had been posted in this blog:
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. Guatemala
Sinkhole
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
unpredictable.
3. Winter Park,
Florida, Sinkhole
The sinkhole in Winter Park, Florida, 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. Mulberry,
Florida, Sinkhole
This 185-foot-deep (56-meter-deep) sinkhole appeared in 1994
in Mulberry, Florida, 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.
5. Blue Hole,
Belize
Sinkholes can happen anywhere water can erode a vertical
channel that connects to a horizontal drain, a situation that allows a column
of solid material to wash away, Missouri
State’s Gouzie explained. 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
Years of mining for zinc and lead has left Picher,
Oklahoma, near the border with Kansas, literally full
of holes - including this sinkhole seen in 2008. Some mines were dug too close to
the surface, and the roofs were unable to support the weight of earth on top,
leading to collapses. “It has happened in Missouri
and in western Pennsylvania from coal mining,”
Missouri State’s Gouzie said. “We’ve gotten
better with building mines so the roofs can support the weight over top of
them.”
7. Iceland
Sinkhole
Adventure kayaker Mick Coyne lowers himself down the wall of
a sinkhole toward the headwaters of the Jokulsa, Iceland’s second longest river.
Though the river is fed by melt from a glacier, this 150-foot (45-meter),
inverted funnel-shaped hole was blasted into being by rising steam from
geothermal vents below.
8. Ik-Kil Cenote,
Mexico
Swimmers float in the saphirre waters of the Ik-Kil Cenote,
near the Maya site of Chichén Itzá in Mexico’s
Yucatán Peninsula. Cenote means “natural well”
in Spanish. Sinkholes occurring at sea level will fill up as high as the water
table, creating the famous clear blue pools, used by the Maya royalty for both
relaxation and ritual sacrifices.
9. Neversink Pit,
Alabama
Neversink Pit, a wet limestone sinkhole in Alabama seen above in 1998, is about 50 feet
(15 meters) deep and houses a rare species of fern. The sinkhole was bought in
the 1990s by a group of cavers to preserve it for future generations. 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.
Source : http://www.chilloutpoint.com
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