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Limestone is calcium carbonate, CaCO3. Water with some carbon dioxide dissolved in it is carbonic acid, H2CO3. Here's the formula:

H2CO3 + CaCO3 --> CaO + H2O + 2CO2

This reaction yields water, carbon dioxide, and the mineral calcite, which is primarily what rock formations in caves are made of.

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Q: What chemicl reaction is involed in the formation of limestone caves?
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