==National Geographic - Earth's Giant Hole (2012)==


[[http://forums.mvgroup.org/index.php?showtopic=46392|National Geographic - Earth's Giant Hole (2012)]]


[[http://youtu.be/0NPqTKL3Jck|{{http://forums.mvgroup.org/release.images/Harry65/Earths.Giant.Hole%205.jpg?300|See Preview}}]]

Earth's Giant Hole
Professor Darryl Granger explores China's tiankengs - giant natural holes, hundreds of metres deep, which have developed in unusual environmental conditions.


==See Also==

{{http://www.wondermondo.com/Countries/As/China/Guangxi/Dashiwei.htm|Wondermondo}}

==Preview==

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==Full Version==

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{{tag>Science Geology China FF 2012 Ar11/12 Name}}