B2 Carbon and Nitrogen cycle

Recycling- the Carbon and Nitrogen cycle 

The Carbon Cycle

Carbon is one of a number of elements that are found in living organisms. Crabon needs to be recycled so that it can become available again to other living organisms.

• Carbon dioxide is removed from the air by photosynthesis in plants
• Feeding passes carbon compounds along a food chain or web

Carbon dioxide is released into the air by:

• plants and animals respiring
• soil bacteria and fungi acting as decomposers
• the burning of fossil fuels (combustion)

Carbon dioxide is also absorbed from the air by oceans. Marine organisms make shells made of carbonate, which become limestone rocks.

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