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But the intense volcanic activity made it almost disappear again.Despite these fits and starts, our oxygen atmosphere prevailed in the end." 1Shuhei Ono, "A novel record of Earth's Archean life, atmosphere, and oceans revealed in multiple-sulfur isotopic signatures" 2Andrey Bekker et al., "A fitful rise of atmospheric oxygen" Chemical analysis of some of the world's oldest rocks has provided the earliest record yet of Earth's atmosphere.The interregnum implies that at least one other necessary condition for O.The cause of Earth's surface oxidation would be the same cause as it is for other planets with oxidized surfaces: hydrogen escape to space.
We think that there were microbes in the oceans, before the oxygenated atmosphere, which would have used methane for energy.
This was triggered by cyanobacteria producing the oxygen which developed into multicellular forms as early ...
Earth's early atmosphere is thought to have contained only small amounts of oxygen, not enough to sustain life as we know it today.
Oxygenic photosynthesis appears to be necessary for an oxygen-rich atmosphere like Earth's.
But available geological and geochemical evidence suggest that at least 200 Myr, and possibly more than 700 Myr, elapsed between the advent of oxygenic photosynthesis and the establishment of an oxygen atmosphere.
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The oxygen atmosphere wasn't here to stay, however.