Carbon in the lithosphere is held in soil in the form of both organic and inorganic carbon which often as calcium carbonate. Carbon can leave the soil through soil respiration – which releases CO2, or by erosion – which can carry it into rivers or the ocean, where it then enters the hydrosphere.
The carbon in the lithosphere was initially found in the form of carbonate rocks. The formation of these carbonate rocks took place due to the deposition of the ancient marine plankton at the base of the ocean because of the activity of pressure and heat and got transformed into coal and petroleum.
The burning of fossil fuel, that is, the coal and petroleum gave rise to carbon dioxide, thus, it can be concluded that initially in the lithosphere the carbon prevailed in the form of carbonate rocks.
