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Mammoth Cave National ParkMatt Bransford leading a group into Mammoth Cave, circa 1920
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Mammoth Cave National Park
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Soda straw stalactite  

Did You Know?
Stalactites grow downward – they hang "tight" to the ceiling – while stalagmites grow upward – they "might" reach the ceiling someday. Mammoth Cave's formations include many types of calcite formations.

Last Updated: June 11, 2007 at 13:45 EST