Carbonic Acid

Rain can dissolve CO2 and make carbonic acid

https://www.visionlearning.com/en/library/Earth-Science/6/The-Carbon-Cycle/95#:~:text=thousands%20of%20years.-,The%20geological%20carbon%20cycle,Rock%20Cycle%20module%20for%20information).

but apparently only for less than a second but it is a important for the formation of limestone. These are some testing done in Berkeley Lab:

New Insights on Carbonic Acid in Water

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