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| Distribution of organic carbon in Earth (excluding dispersed carbon in rocks and sediments, which equals nearly 1,000 times this total amount). Numbers in gigatons (1015 tons) of carbon. |
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U.S. Department of the Interior, U.S. Geological Survey
URL: http://pubs.usgs.gov/fs/gas-hydrates/figures/fig3.html
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Last modified: 15:56:38 Mon 01 Dec 2003
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