1. Carbon dioxide is removed from the atmosphere by dissolving in water and forming carbonic acid
CO2 + H2O -> H2CO3 (carbonic acid)
2. Carbonic acid is used to weather rocks, yielding bicarbonate ions, other ions, and clays
H2CO3 + H2O + silicate minerals -> HCO3- + cations (Ca++, Fe++, Na+, etc.) + clays
3. Calcium carbonate is precipitated from calcium and bicarbonate ions in seawater by marine organisms like coral
Ca++ + 2HCO3- -> CaCO3 + CO2 + H2O
the carbon is now stored on the seafloor in layers of limestone
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