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The article was orginally published at: World’s Longest Cave is Still Growing Even Longer (PICS)

Photo via NM
Researchers were recently surprised to find that the world’s longest cave formation–the Fort Stanton Cave in New Mexico–is growing even longer. They discovered that calcite is still accumulating in the trough of the cave, which cuts through miles and miles of rock. More photos of the stunning, tunnel-like cave after the jump….Read the full story on TreeHugger
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