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.