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The Iron Cycle Air O2 Water H2O e- Fe3+ Sediment Fe3+ 2H+ eOrganic Matter Start Fe2+ CO2 Continue Biogeochemical cycling of iron in aquatic sediments is driven by oxidation of organic matter below the surface where there is no oxygen present. This produces excess electrons. The electrons are used to reduce Fe3+ to Fe2+. When the reduced iron comes into contact with air, the electrons are transferred to oxygen and the Fe2+ is oxidized back to Fe3+. All of these reactions can be carried out by different groups of bacteria
