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Oceans then soak up some carbon from the atmosphere taking carbon from the atmosphere into the oceans.
Over time, sediments in the ocean can be turned into rock, such as limestone, using parts of shells containing calcium carbonate.
This limestone rock gets pushed up to land by tectonic Earth movements, causing huge amounts of carbon to move from the ocean to land; in this case, back into fossil fuels.
Carbon that was trapped in the sediments forms gas and oil.
Fossil fuels are then taken and burned by humans to power things such as, factories and cars. This causes carbon to move into the atmosphere.
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