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- Geological_history_of_oxygen abstract "Before photosynthesis evolved, Earth's atmosphere had no free oxygen (O2). Photosynthetic prokaryotic organisms that produced O2 as a waste product lived long before the first build-up of free oxygen in the atmosphere, perhaps as early as 3.5 billion years ago. The oxygen they produced would have been rapidly removed from the atmosphere by weathering of reducing minerals, most notably iron. This 'mass rusting' led to the deposition of iron oxide on the ocean floor, forming banded iron formations. Oxygen only began to persist in the atmosphere in small quantities about 50 million years before the start of the Great Oxygenation Event. This mass oxygenation of the atmosphere resulted in rapid buildup of free oxygen. At current rates of primary production, today's concentration of oxygen could be produced by photosynthetic organisms in 2,000 years. In the absence of plants, the rate of oxygen production by photosynthesis was slower in the Precambrian, and the concentrations of O2 attained were less than 10% of today's and probably fluctuated greatly; oxygen may even have disappeared from the atmosphere again around 1,900 million years ago These fluctuations in oxygen concentration had little direct effect on life, with mass extinctions not observed until the appearance of complex life around the start of the Cambrian period, 541 million years ago. The presence of O2 provided life with new opportunities. Aerobic metabolism is more efficient than anaerobic pathways, and the presence of oxygen undoubtedly created new possibilities for life to explore.Since the start of the Cambrian period, atmospheric oxygen concentrations have fluctuated between 15% and 35% of atmospheric volume. The maximum of 35% was reached towards the end of the Carboniferous period (about 300 million years ago), a peak which may have contributed to the large size of insects and amphibians at that time. Whilst human activities, such as the burning of fossil fuels, have an impact on relative carbon dioxide concentrations, their impact on the much larger concentration of oxygen is less significant.".
- Geological_history_of_oxygen thumbnail Oxygenation-atm-2.svg?width=300.
- Geological_history_of_oxygen wikiPageExternalLink mg20527461.100-first-breath-earths-billionyear-struggle-for-oxygen.html.
- Geological_history_of_oxygen wikiPageExternalLink earths-oxygen-a-mystery-easy-to-take-for-granted.html?_r=0&pagewanted=print.
- Geological_history_of_oxygen wikiPageID "24377796".
- Geological_history_of_oxygen wikiPageLength "10133".
- Geological_history_of_oxygen wikiPageOutDegree "25".
- Geological_history_of_oxygen wikiPageRevisionID "679429051".
- Geological_history_of_oxygen wikiPageWikiLink Animal.
- Geological_history_of_oxygen wikiPageWikiLink Atmosphere_of_Earth.
- Geological_history_of_oxygen wikiPageWikiLink Banded_iron_formation.
- Geological_history_of_oxygen wikiPageWikiLink Banded_iron_formations.
- Geological_history_of_oxygen wikiPageWikiLink Cambrian.
- Geological_history_of_oxygen wikiPageWikiLink Cambrian_explosion.
- Geological_history_of_oxygen wikiPageWikiLink Carboniferous.
- Geological_history_of_oxygen wikiPageWikiLink Carboniferous_period.
- Geological_history_of_oxygen wikiPageWikiLink Category:Oxygen.
- Geological_history_of_oxygen wikiPageWikiLink Complex_life.
- Geological_history_of_oxygen wikiPageWikiLink Ediacara_biota.
- Geological_history_of_oxygen wikiPageWikiLink Ediacaran_biota.
- Geological_history_of_oxygen wikiPageWikiLink Evolution_of_plants.
- Geological_history_of_oxygen wikiPageWikiLink Evolutionary_history_of_plants.
- Geological_history_of_oxygen wikiPageWikiLink Extinction_event.
- Geological_history_of_oxygen wikiPageWikiLink Fossil_fuel.
- Geological_history_of_oxygen wikiPageWikiLink Great_Oxygenation_Event.
- Geological_history_of_oxygen wikiPageWikiLink Mass_extinction.
- Geological_history_of_oxygen wikiPageWikiLink Metazoa.
- Geological_history_of_oxygen wikiPageWikiLink Multicellular_organism.
- Geological_history_of_oxygen wikiPageWikiLink Multicellularity.
- Geological_history_of_oxygen wikiPageWikiLink Oxygen.
- Geological_history_of_oxygen wikiPageWikiLink Photosynthesis.
- Geological_history_of_oxygen wikiPageWikiLink Photosynthetic.
- Geological_history_of_oxygen wikiPageWikiLink Precambrian.
- Geological_history_of_oxygen wikiPageWikiLink Primary_production.
- Geological_history_of_oxygen wikiPageWikiLink Prokaryote.
- Geological_history_of_oxygen wikiPageWikiLink Prokaryotic.
- Geological_history_of_oxygen wikiPageWikiLink Pterosaur.
- Geological_history_of_oxygen wikiPageWikiLink Snowball_Earth.
- Geological_history_of_oxygen wikiPageWikiLink File:Oxygenation-atm-2.svg.
- Geological_history_of_oxygen wikiPageWikiLinkText "Free oxygen".
- Geological_history_of_oxygen wikiPageWikiLinkText "Geological history of oxygen".
- Geological_history_of_oxygen wikiPageWikiLinkText "oxygen in the atmosphere".
- Geological_history_of_oxygen date "May 2014".
- Geological_history_of_oxygen hasPhotoCollection Geological_history_of_oxygen.
- Geological_history_of_oxygen reason "undefined, unexplained".
- Geological_history_of_oxygen wikiPageUsesTemplate Template:Chem.
- Geological_history_of_oxygen wikiPageUsesTemplate Template:Citation_needed.
- Geological_history_of_oxygen wikiPageUsesTemplate Template:Clarify.
- Geological_history_of_oxygen wikiPageUsesTemplate Template:Ma.
- Geological_history_of_oxygen wikiPageUsesTemplate Template:Reflist.
- Geological_history_of_oxygen wikiPageUsesTemplate Template:Rp.
- Geological_history_of_oxygen subject Category:Oxygen.
- Geological_history_of_oxygen type Article.
- Geological_history_of_oxygen type Article.
- Geological_history_of_oxygen type Element.
- Geological_history_of_oxygen comment "Before photosynthesis evolved, Earth's atmosphere had no free oxygen (O2). Photosynthetic prokaryotic organisms that produced O2 as a waste product lived long before the first build-up of free oxygen in the atmosphere, perhaps as early as 3.5 billion years ago. The oxygen they produced would have been rapidly removed from the atmosphere by weathering of reducing minerals, most notably iron.".
- Geological_history_of_oxygen label "Geological history of oxygen".
- Geological_history_of_oxygen sameAs m.0118dj60.
- Geological_history_of_oxygen sameAs Q17105640.
- Geological_history_of_oxygen sameAs Q17105640.
- Geological_history_of_oxygen wasDerivedFrom Geological_history_of_oxygen?oldid=679429051.
- Geological_history_of_oxygen depiction Oxygenation-atm-2.svg.
- Geological_history_of_oxygen isPrimaryTopicOf Geological_history_of_oxygen.