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| Thursday, 5 March 2009 |
| Top 10 Amazing Holes in the Earth 2
|
 | | The Great Blue Hole is an underwater sinkhole off the coast of Belize. The hole is 1,000 feet across and 400 feet deep. It was formed as a limestone cave during the last iceage.  | | The Bingham Canyon Mine is a copper mine in the Oquirrh mountains, Utah. The mine is 0.75 mile (1.2 km) deep, 2.5 miles (4 km) wide. It is the world's largest manmade excavation  | | The Monticello Dam is a dam in Napa County, California, United States most noted for its large circular spillway with a rate of 48,400 cubic feet per second  | | The Kimberley Diamond Mine (also known as the Big Hole) holds the (disputed) title of being the largest hand-dug hole in the world. From 1866 to 1914 50,000 miners dug the hole with picks and shovels, yielding 2,722 kg of diamonds. Attempts are being made to have it registered as a world heritage site | | | |  | | In 1971, geologists discovered a massive underground deposit of natural gas on this site. Whilst excavating the hole to tap the gas, thedrilling rig collapsed leaving a massive hole. To prevent poisonous gasses from escaping, the hole was allowed to burn. It continues to burn to this day and has done so without ceasing |
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posted by Juanes @ 21:49
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