national_geographic_-_earth_s_giant_hole

National Geographic - Earth's Giant Hole (2012)

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.

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Science, Geology, China, Full Versions, 2012, November 2012, Documentaries

National Geographic - Earth's Giant Hole (2012)

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