Where is the majority (~80%) of the carbon dioxide that was abundant in Earth's early atmosphere?

A. It is contained with the biomass of plants.
B. It is trapped within the glaciers of Antarctica and Greenland.
C. It has been lost to space.
D. It is chemically tied up in limestone.
E. It has radioactively decayed to carbon monoxide.


Answer: D

Environmental & Atmospheric Sciences

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