Where Did the Majority of the Large Amount of Carbon

question 101

Multiple Choice

Where did the majority of the large amount of carbon dioxide (CO₂) from the second major atmosphere to form on the early Earth end up?

• A) as nitrogen oxides and carbon, after chemical reactions with the majority component of the atmosphere, the nitrogen molecules
• B) absorbed by plant life and transformed into solid carbon and gaseous oxygen
• C) dissolved in the oceans and, via the shells of living creatures, in the limestone of many mountain ranges
• D) still in the atmosphere, but the quantity of nitrogen and oxygen has since risen to make these constituents the most abundant and relegate carbon dioxide to a minor constituent

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