Slow carbon cycle

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Define residence time
the length of time that a molecule of water or carbon dioxide etc remains in natural storage (eg atmosphere or oceans)
How much carbon is circulated by the SCC?
Between 10 - 100 million tonnes a year
What is the residence time for carbon held in rocks
150 million years
How are carbon rich sedimentary rocks created?
CO2 diffuses from the atmosphere into oceans.
Marine organisms make their shells and skeletons by fixing dissolved carbon with calcium to form calcium carbonate.
When they die their remains sink to the ocean floor
They accumulate and over millions of years heat and pressure convert them into carbon rich sedimentary rocks.
What do fossil fuels as well as deep-ocean sediments act like?
carbon sinks

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Slow carbon cycle

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2.3 Structure and bonding of carbon

6.2 Cash flow

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1.4.2 The Rock Cycle