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19 Φεβ 2014 · The initial increase of O2 in the atmosphere, its delayed build-up in the ocean, its increase to near-modern levels in the sea and air two billion years later, and its cause-and-effect ...
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- The rise of atmospheric oxygen
Clues from ancient rocks are helping to produce a coherent...
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16 Μαΐ 2016 · The rise of atmospheric oxygen occurred in two stages: approximately 2.5 to 2.0 billion years ago during the Great Oxidation Event and roughly 2 billion years later during the...
16 Ιαν 2008 · Clues from ancient rocks are helping to produce a coherent picture of how Earth's atmosphere changed from one that was almost devoid of oxygen to one that is one-fifth oxygen.
20 Δεκ 2013 · Oxygenic photosynthesis appears to have evolved well before O 2 levels increased in the atmosphere, at around 2.4 Ga. This has led to numerous suggestions as to what may have kept O 2 suppressed and then eventually allowed it to rise.
19 Αυγ 2009 · So how did Earth end up with an atmosphere made up of roughly 21 percent of the stuff? The answer is tiny organisms known as cyanobacteria, or blue-green algae.
20 Φεβ 2014 · The initial increase of O2 in the atmosphere, its delayed build-up in the ocean, its increase to near-modern levels in the sea and air two billion years later, and its cause-and-effect relationship with life are among the most compelling stories in Earth's history.
17 Ιαν 2008 · The initial increase of O2 in the atmosphere, its delayed build-up in the ocean, its increase to near-modern levels in the sea and air two billion years later, and its cause-and-effect relationship with life are among the most compelling stories in Earth’s history.
