Like Mars and Venus, Earth Originally Had a Significant Amount

question 36

Multiple Choice

Like Mars and Venus, Earth originally had a significant amount of carbon dioxide in its atmosphere.Where is the majority of the carbon now?

• A) It has escaped into outer space.
• B) It is bound up in the plant life on Earth.
• C) It is bound up in rocks.
• D) It is dissolved into the oceans.
• E) It is still in the atmosphere in the form of complex molecules.