The Atmosphere Contains a Relatively Low Concentration of Carbon, Mostly

question 127

Multiple Choice

The atmosphere contains a relatively low concentration of carbon, mostly in the form of CO₂.Why is this small amount considered important in the carbon cycle?

• A) Although small, it is the largest pool of carbon on Earth.
• B) It is the only source of carbon capable of moving from one pool to another.
• C) It remains in the atmosphere for long periods of time.
• D) Its concentration in the atmosphere is currently decreasing.
• E) It is the source of carbon for living organisms that carry out photosynthesis.

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