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6 votes

Why cannot people burn all the atmospheric oxygen?

Photosynthesis has not stopped. It happens all the time, splitting water and carbon dioxide, and producing oxygen and carbohydrates. Likewise, organic matter rots and decomposes all the time, ...
Wolfgang Bangerth's user avatar
6 votes
Accepted

Why is Great Oxidation Event associated with Iron oxidation but not Aluminum or Silicon?

Because Al and Si were already oxidised to begin with. When the Earth formed, it had some amount of metals (Fe, Si, Mg, Al, Ca, etc) and a fixed amount of oxygen to bond with those metals. Certain ...
Gimelist's user avatar
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5 votes

Before the Great Oxygenation Event, where was the oxygen?

the great oxygenation event was caused by the evolution of photosynthesis, photosynthesis turns CO2 and water in to sugar and oxygen. so the oxygen came from CO2 and water. keep in mind CO2 levels ...
John's user avatar
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5 votes
Accepted

Why limestone formation was not a concern in atmosphere oxidation event?

First, let me clarify this again: Al2O3 is not clay. Now, back to topic. You are mixing apples and oranges here. The geological section you are referring it was deposited 2 billion years after the GOE....
Gimelist's user avatar
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4 votes

Before the Great Oxygenation Event, where was the oxygen?

I'd like to add to the other answers. Yes, it is correct that photosynthesis by cyanobacteria caused the rise of atmospheric oxygen. Some important points to talk about: Estimated fossil fuels are ...
Gimelist's user avatar
  • 23.1k
4 votes

Why cannot people burn all the atmospheric oxygen?

If I understand it right, you are assuming that in the beginning we had CO2, which was then split to organic carbon and O2 via photosynthesis. And now you are asking if it's possible to reverse all of ...
Gimelist's user avatar
  • 23.1k
2 votes

Why does Earth have abundant oxygen in the atmosphere?

My answer goes a little beyond the evidence -- there isn't much evidence. The question There's a lot of free oxygen now. This oxygen did not suddenly come from underground or from space. So it used ...
J Thomas's user avatar
  • 281
2 votes

Is the atmospheric composition still changing naturally?

Yes the atmosphere is always in mild flux, humans are just changing it MUCH more severely than it does naturally. the atmosphere even changes from season to season, that is the little up and down on ...
John's user avatar
  • 6,931
1 vote

Before the Great Oxygenation Event, where was the oxygen?

Someone (I've lost track of whom. Tl;dr.) is seriously underestimating the amount of reduced carbon in sediments. Having examined (and logged, and submitted to oil companies and government, hundreds ...
Rockdoctor's user avatar
1 vote

Before the Great Oxygenation Event, where was the oxygen?

What I have learned from this is that things were very different before the Great Oxygenation Event; more than just the same elements rearranged. If all of the free oxygen came from water (and the ...
J Thomas's user avatar
  • 281
1 vote

Before the Great Oxygenation Event, where was the oxygen?

Actually quite interesting. Oxygen is made by the splitting of water, either by photosynthesis or by UV-based photo-dissociation in the upper atmosphere. In the case of photosynthesis, the reduced-...
Andrew Jon Dodds's user avatar
1 vote

Is there conclusive evidence to refute an earlier oxygenation of the Earth's atmosphere?

The earliest photosynthetic marine organisms (cyanobacteria) are known to have been established by 3.8 billion years ago from the isotopic composition of sedimentary rocks. The earliest microfossils ...
Michael Walsby's user avatar

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