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In caves, dripping groundwater containing calcium bicarbonate can form stalactites and stalagmites. When the water is exposed to air, some of the calcium bicarbonate turns into calcium carbonate, which gets deposited on the ground. What makes this process a chemical change?

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Hagrid

In caves, dripping groundwater containing calcium
bicarbonate can form stalactites and stalagmites. When the water is exposed to
air, some of the calcium bicarbonate
turns into calcium carbonate, which gets deposited on the ground. The process
that is a chemical change is when some of the calcium bicarbonate turns into calcium carbonate, which gets deposited
on the ground.

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