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Date: 2011-04-29 11:59:07Pedology Soil science Photosynthesis Carbon dioxide Greenhouse gases Active layer Permafrost Carbon cycle Thaw depth Physical geography Chemistry Earth | Permafrost-Schuur-nearfinal.inddAdd to Reading ListSource URL: nature.nps.govDownload Document from Source WebsiteFile Size: 324,49 KBShare Document on Facebook |