Biosphere & Lithosphere
Buses, cars, boats, trains and planes all emit carbon. They use it in the form of coal, diesel or petrol and release carbon once it has been burnt. The carbon is all emitted into the atmosphere.
The lithosphere holds carbon that has formed from plant and animal fossils that have broken down. The biosphere contributes to the carbon cycle because trees take in carbon from the atmosphere and then they expel oxygen, and animals eat plants which contain carbon.
The hydrosphere is the biggest carbon store. At sea, phytoplankton photosynthesis at the ocean surface. This removes carbon dioxide, allowing more carbon to dissolve from the atmosphere. When phytoplankton die, they sink to the ocean floor, taking the carbon with them.
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