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Guatemala Guatemala City District of the capital on May 30, there is a depth of about 100 m in giant pits, shocked.

A strict interpretation of the geological terms, tiankeng (sinkhole) refers to as the water continuously eroded solid bedrock, surface formed by collapse occurred a huge pits. United States and many parts of the day the chance of the pit. The following is the world's most famous day pit.

1.2010 year Guatemala tiankeng

Guatemala tiankeng 2010

Guatemala giant hang the tiankeng further expansion of the term, that is, the ground suddenly collapse.

Guatemala City is part of the urban land is not in the solid bedrock, but rather a layer of relaxation, the composition of the volcanic pumice stone, usually several hundred feet thick. At least one geologist, Guatemala City's latest tiankeng is raised by a pipeline leak, not natural phenomena. Overall, Guatemala recurrence of such events more likely, but it is very difficult to forecast.

2.2007 year Guatemala tiankeng

In 2007, Guatemala-day pit

In 2007, Guatemala City has seen a similar distance from the tiankeng, and the recent emergence of the tiankeng also not far away.

Under photos, this two-day pit of diameter approximately 60 feet (approximately 18 m), depth of about 300 feet (approximately 100 m). Typically, the Administration will use large blocks of stones and other debris will pit fill the day. Over time, the water erosion and air drying effect, also cause tiankeng tilt.

In the United States, Florida, Winter Park tiankeng, for example, it is identical to the gradient of Guatemala tiankeng, depth of about 100 feet (approximately 30 meters).

However, the Florida Sunshine State of reputation, adequate lighting, making day hang in approximately 24 hours slowly tilts. United States Missouri State University geologist come down cell-cell Wu Ze (Doug Gouzie) said: I think around Guatemala City days do not so hang quickly collapse.

3. Florida Winter Park-day pit

Florida, Winter Park-day pit

According to Peter describes jigau, Winter Park-day pit formation in 1981 in the city, a public swimming pool, the swimming pool is leak, I've never seen a full report.

He said that water could pool bottom of small cracks seep into the soil below. As Florida's sandy soil, even swimming pools surrounding aquatic plants may slowly enough soil washed, erosion following solid limestone layers. Jigau Peter pointed out that the United States Geological Survey Bureau draws throughout the entire us rock type. Scientists still need to underground cracks and water flow through the cracks of extensive research, so that they occur-day pit sites for prediction.

4. Florida Marco Marbury tiankeng

Florida Marco Marbury tiankeng

This deep about 185 feet (about 56 m)-day pit in 1994 in Florida in the city of mulberry, collapse of dumping in mining enterprises IMC-Agrico stack wastes.

The company was to extract phosphate rock mining. Phosphate is a chemical substance is a major component of fertilizer, mainly used in the manufacture of phosphoric acid, as well as enhanced soda and various food taste. However, in phosphate extracted from the rock, the main ingredient is gypsum waste is treated as a slurry filtered out.

As the layers of gypsum is dried, formed cracks, as appears in drying mud crack.

Subsequently, the water flow in the crack in the ground substance volumes go to tiankeng formation. United States regulatory agencies that IMC-Agrico company should bear management responsibility of the tiankeng, avoid harmful underground drinking water supply.

5. Belize City, Blue Grotto hang

Belize City, blue

Dongtian hang

According to the Missouri State University geologist jigau Peter describes, what, as long as the water erosion connection vertical horizontal drainage system, which might happen day, because in this case, a large number of solid substances being washed away.

If the tiankeng in near the coast or in the sea mdash mdash;; such as Honduras Belize City coast lighthouse reef, the famous Blue cave, seawater rapidly after the collapse into a deep see bottom of the pool.

6. Oklahoma skin Sher's pit

Oklahoma skin Sher's pit

Long-term exploitation of zinc and lead mineralization to Oklahoma and Kansas leather shell near the junction of the ground full of pitfalls, including 2008 photos of the pit.

Some of mine in the mining process too close to the surface, above the top could not support the weight of the soil, eventually leading to collapse. Missouri's jigau Peter said, Missouri and Pennsylvania's coal mine near West also had a pit. Our technical building mine, above the top is sufficient to support the weight of the soil.

7. Iceland pit

Iceland pit

Adventurer Mick middot; coiner and his kayak along the River II, Iceland; mdash mdash; Joe coursat River a pit in the pit wall.

Joe coursat River River water from a glacier melting, the depth of 150 feet (45 m approximately), flip the funnel-shaped pit from below the geothermal vents of the rising steam.

8. Mexico Iqbal middot; Kiel natural wells

Mexico Iqbal middot; Kiel natural wells

A group of swimming enthusiasts in cuijk middot; Kiel natural wells Sapphire color of the water to enjoy swimming fun.

This natural wells are located in Mexico Yucatan Beach Itzá in ancient Mayan ruins nearby. At sea level the pit depth will be filled with water, and groundwater, forming the famous crystal clear blue water. Maya Royal will relax in the pool inside and hold sacred ceremony.

9. Portugal Lisbon's pit

Portugal Lisbon's pit

The 2003 shooting in Portugal Lisbon, a sad bus to become a big streets pit lunch.

Missouri's jigau Peter said to cause water flows underground soil of any factors that can accelerate the pit formation. In many cities, sewer, cable and other public infrastructure in fill in loose material, the trench backfill will over time be eventually washed away. In some cases, the road will eventually become a below basically empty concrete bridge. Jigau Peter said: you are now on the road could not bear the weight of the truck passed over.

10. Alabama never sunken pit of

Alabama never sunken pit of

Photo taken in 1998.

Alabama never sunk the hang is a limestone pit depth approximately 50 feet (approximately 15 m) or so, there lived a rare fern. The 1990s, a group of exploratory tunnel users into buying the pit, in this way for generations to protect this natural wonder.

Karst limestone or dolomite usually Shiyan bed dissolved form.

United States of karst landscape is mainly located in Missouri, Arkansas, Kentucky, Tennessee, Alabama, Texas, and northern Florida in most areas. These areas of the landmark features for sinking streams and underground streams, springs, caves and pitfalls.