ナショナルジオグラフィックのインスタグラム(natgeo) - 2月18日 08時36分

Photo by Robbie Shone @shonephoto | Deep underground in Lechuguilla Cave, part of Carlsbad Caverns National Park, we see inside a hollowed-out stalagmite. What is most unusual about it are the holes, as they are very rare and are probably formed when a drop of a water with a higher level of acidity falls from the ceiling and erodes the inside of the stalagmite.

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