The circulation of the element Carbon among Earth's atmosphere, land, oceans, and organisms.

Combustion.

Burning.

Photosynthesis.

In the atmosphere, soil, and fossil fuels.

The process by which green plants use sunlight to convert carbon dioxide and water into glucose and oxygen.

Plants absorb carbon dioxide from the atmosphere during photosynthesis.

The process by which living organisms convert oxygen and glucose into energy, releasing carbon dioxide back into the atmosphere.

Decomposers break down dead organic matter, returning carbon to the soil and atmosphere.

Fossil fuels release carbon dioxide into the atmosphere when burned.