Multiple choice

What gas is the carbon cycle based on?

  1. Carbon monoxcide

  2. Carbon dioxide

  3. Carbon disulphide

  4. Carbon trioxide
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The carbon cycle is primarily based on carbon dioxide (CO2), which moves between atmosphere, oceans, organisms, and earth. Carbon monoxide (CO) is a toxic pollutant, carbon disulphide (CS2) is an industrial chemical, and carbon trioxide doesn't exist as a stable compound. CO2 is the form of carbon that cycles through Earth's systems.

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