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The global carbon cycle - Coggle Diagram
The global carbon cycle
Stores/sinks
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Sedimentary rocks: 60,000-100,000,000
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Slow carbon cycle
Carbon stored in rocks, sea-floor sediments and fossil fuels are locked away for millions of years. Total amount of carbon circulated = 10-100 million tonnes a year.
CO2 diffuses from atmosphere into the oceans where marine organisms make their shells and skeletons by fitting dissolved carbon together with calcium = calcium carbonate
Once dead, the organisms accumulate and heat and pressure can then convert them into carbon-rich sedimentary rocks.
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On land, partially decomposed organic material may be buried beneath younger rocks to form carbonaceous rocks like coal and natural gas, these too endure millions of years
Fast carbon cycle
Circulates more rapidly between atmosphere, oceans, biosphere (living organisms) and soils
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