<Table> Carbon pools in the major reservoirs on earth . <Tr> <Th> (show) Pool </Th> <Th> Quantity (gigatons) </Th> </Tr> <Tr> <Td> Atmosphere </Td> <Td> 720 </Td> </Tr> <Tr> <Td> Ocean (total) </Td> <Td> 38,400 </Td> </Tr> <Tr> <Td> Total inorganic </Td> <Td> 37,400 </Td> </Tr> <Tr> <Td> Total organic </Td> <Td> 1,000 </Td> </Tr> <Tr> <Td> Surface layer </Td> <Td> 670 </Td> </Tr> <Tr> <Td> Deep layer </Td> <Td> 36,730 </Td> </Tr> <Tr> <Td> Lithosphere </Td> <Td> </Td> </Tr> <Tr> <Td> Sedimentary carbonates </Td> <Td>> 60,000,000 </Td> </Tr> <Tr> <Td> Kerogens </Td> <Td> 15,000,000 </Td> </Tr> <Tr> <Td> Terrestrial biosphere (total) </Td> <Td> 2,000 </Td> </Tr> <Tr> <Td> Living biomass </Td> <Td> 600 - 1,000 </Td> </Tr> <Tr> <Td> Dead biomass </Td> <Td> 1,200 </Td> </Tr> <Tr> <Td> Aquatic biosphere </Td> <Td> 1 - 2 </Td> </Tr> <Tr> <Td> Fossil fuels (total) </Td> <Td> 4,130 </Td> </Tr> <Tr> <Td> Coal </Td> <Td> 3,510 </Td> </Tr> <Tr> <Td> Oil </Td> <Td> 230 </Td> </Tr> <Tr> <Td> Gas </Td> <Td> 140 </Td> </Tr> <Tr> <Td> Other (peat) </Td> <Td> 250 </Td> </Tr> </Table> <Tr> <Th> (show) Pool </Th> <Th> Quantity (gigatons) </Th> </Tr> <Tr> <Td> Atmosphere </Td> <Td> 720 </Td> </Tr> <Tr> <Td> Ocean (total) </Td> <Td> 38,400 </Td> </Tr>

Where is the largest store of nitrogen on earth