29/12/2017
Hiding behind the surge landscape in the midle-south of kentucky state , U.S.A, There is the longest cave in the world : Mammoth Cave . It called Mammoth is not from the name of an elephant who was...
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the longest cave in the world, This cave have at least 365 mil (587 km ) subway line. Mammoth cave is being formed in 10 million years ago , when the soluble lime rocks, remainder bottom of the old sea, scraped by rain and stream flow from the surface.