自然界10大冰雪奇迹:冰冻瀑布和神秘冰矛(2)
冰洞
冰洞是一种自然洞穴,其内部包含着大量的冰。形成冰洞的基本条件是全年温度必须在零摄氏度以下,并且水能够进入到洞穴内的寒冷地带。目前全球已发现多处冰洞,但是奥地利爱里斯森威尔特(Eisriesenwelt)冰洞是迄今发现最大的冰洞。
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