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archean |
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| navigate by keyword : greenstone belts archean rocks microbial mat photosynthesis eon sun continents bacteria solid crust formation oxygen stromatolites archaea magma ocean atmosphere volcanic gases beginning volcano oldest earth prehistory geologic cyanobacteria geological life history evolution extinct prehistoric vector eps10 educational poster paleontology biology science art drawing vulcano ancient carbon dioxide methane ammonia nitrogen water vapor timeline primordial artistic |
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| Archean Eon Simple, single-celled organisms, bacteria, and archaea first appeared. Cyanobacteria produced oxygen through photosynthesis. The Archean atmosphere lacked free oxygen, but over time, oxygen levels began to increase |
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Stockphotos.ro (c) 2025. All stock photos are provided by Dreamstime and are copyrighted by their respective owners. |
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