<P> Most of the earth 's carbon is stored inertly in the earth 's lithosphere . Much of the carbon stored in the earth 's mantle was stored there when the earth formed . Some of it was deposited in the form of organic carbon from the biosphere . Of the carbon stored in the geosphere , about 80 % is limestone and its derivatives , which form from the sedimentation of calcium carbonate stored in the shells of marine organisms . The remaining 20 % is stored as kerogens formed through the sedimentation and burial of terrestrial organisms under high heat and pressure . Organic carbon stored in the geosphere can remain there for millions of years . </P>
<P> Most of the earth 's carbon is stored inertly in the earth 's lithosphere . Much of the carbon stored in the earth 's mantle was stored there when the earth formed . Some of it was deposited in the form of organic carbon from the biosphere . Of the carbon stored in the geosphere , about 80 % is limestone and its derivatives , which form from the sedimentation of calcium carbonate stored in the shells of marine organisms . The remaining 20 % is stored as kerogens formed through the sedimentation and burial of terrestrial organisms under high heat and pressure . Organic carbon stored in the geosphere can remain there for millions of years . </P>
where is the most carbon found on earth
where is the most carbon found on earth
the earth 's lithosphere
the earth 's lithosphere