今日灵感，岩洞里的钟乳石能慢慢长大，那它们是生物吗？
stalactite 钟乳石 （向下悬挂）
stalagmite 石笋 （向上生长）
每日一词～stalactite
A stalagmite is a type of rock formation that rises from the floor of a cave due to the accumulation of material deposited on the floor from ceiling drippings. Stalagmites may be composed of lava,minerals,mud,peat,pitch,sand,sinter and amberat (crystallized urine of pack rats).
The corresponding formation hanging down from the ceiling of a cave is a stalactite.Mnemonics have been developed for which word refers to which type of formation; one is that stalactite has a C for "ceiling", and stalagmite has a G for "ground".
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