Stalagmites and Stalactites in The Postojna Cave in Slovenia
Tez has sent in some pictures of his trip into the Postojna Cave in Slovenia. The cave has formed in limestone rocks as the rainwater has seeped through them.
The rainwater dissolves the rock and leaves a space which forms the cave. You can see Class 3 making caves in a similar way in their sugar lump mountains in the blog of the 12 March.
When more water seeps through the rock, it forms drops on the cave roof. These eventually fall to the floor and as they do so a small piece of dissolved rock reforms on the roof. In time as more drops fall from the same place a column of limestone forms called a stalactite. It hangs from the roof.
At the place where the drops hit the floor more dissolved limestone forms. In time they form a column of rock called a stalagmite.
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