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Différence entre stalactite et stalagmite
Quelle différence entre une stalagmite et une stalactite ?
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Stalagmites are typically composed of calcium carbonate , but may consist of lava , 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. The most common stalagmites are speleothems , which usually form in limestone caves.
Calthemite is a secondary deposit, derived from concrete , lime , mortar or other calcareous material outside the cave environment. Degrading concrete has been the focus of many studies and the most obvious sign is calcium-rich leachate seeping from a concrete structure. Calthemite stalactites can form on concrete structures and "artificial caves" lined with concrete e. Calthemites are usually the result of hyperalkaline solution pH 9—14 seeping through a calcareous man-made structure until it comes into contact with the atmosphere on the underside of the structure, where carbon dioxide CO 2 from the surrounding air facilitates the reactions to deposit calcium carbonate as a secondary deposit.