Carbonates

Yes, the question, where did the carbon in the Earth's atmosphere? And it got in touch with calcium and oxygen in carbonates. Yes, even in deposits shale, coal and oil.

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... of photosynthesis. The balance between the plant carbon dioxide removal and animal carbon dioxide generation is equalized also by the formation of carbonates in the oceans. This removes excess carbon dioxide from the air and water (both of which are in equilibrium with regard to carbon dioxide). ...

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... the Cretaceous-Tertiary Boundary Event: Evidence from Extraterrestrial Helium-3 S. Mukhopadhyay,1* K. A. Farley,1 A. Montanari2 Analyses of marine carbonates through the interval 63.9 to 65.4 million years ago indicate a near-constant ßux of extraterrestrial helium-3, a tracer of the accretion ...

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... of photosynthesis. The balance between the plant carbon dioxide removal and animal carbon dioxide generation is equalized also by the formation of carbonates in the oceans. This removes excess carbon dioxide from the air and water (both of which are in equilibrium with regard to carbon dioxide). ...

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