4.9 Carbon Cycle

4.9 describe the stages in the carbon cycle, including respiration, photosynthesis, decomposition and combustion.

1. Photosynthesis
 When photosynthesis occurs, CO2 is used, therefore photosynthesis is responsible for reducing the atmospheric CO2

2. Feeding
 Passage of carbon through different trophic levels

3. Respiration
 Respiration produces CO2 and therefore adds more Carbon dioxide to the atmosphere

4. Decomposition
 All organisms eventually die, their organic molecules are broken down by the decomposer organisms (bacteria and fungi) this results in the release of Carbon Dioxide back into the atmosphere

5. Combustion
 Fossil fuels contain a large amount of carbon so when combusted release a large amount of CO2
 The main uses are industrial uses and also in motor vehicles
 Combustion can also happen natural through lighting and forest fires.

This diagram visually explains most of the concepts