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"The air we breathe is twenty-one percent oxygen, an amount higher than on any other known world. While we may take our air for granted, Earth was not always an oxygenated planet. How did it become this way? Oxygen is the most current account of the history of atmospheric oxygen on Earth"--

551.510 --- Physical properties, composition, general structure of the atmosphere --- 551.510 Physical properties, composition, general structure of the atmosphere --- Oxygen --- Chalcogens --- Nonmetals --- Photosynthetic oxygen evolution --- Oxygène --- Oxygen. --- Archean Eon. --- Avalon Peninsula. --- Dolf Seilacher. --- Earth. --- Ediacaran Fauna. --- Lomagundi isotope excursion. --- Phanerozoic Eon. --- Vladimir Vernadsky. --- anoxygenic phototrophic organisms. --- atmosphere. --- atmospheric oxygen. --- biomass decomposition. --- biosphere. --- cells. --- chemical evidence. --- chemistry. --- chlorophyll. --- cyanobacteria. --- early Earth. --- energy. --- evolution. --- evolutionary history. --- fossils. --- geologic time. --- great oxidation event. --- life. --- mantle. --- methanogenesis. --- organic matter. --- oxygen concentration. --- oxygen production. --- oxygen-producing organisms. --- oxygen. --- oxygenation. --- oxygenic photosynthesis. --- photosynthesis. --- planet Earth. --- plate tectonics. --- pyrite oxidation. --- rapid recycling. --- sulfate reduction. --- sulfide. --- tectonics. --- water. --- weathering.