Questions tagged [oxygen]
Questions regarding the 8th chemical element, a main component of the athmosphere and of the crust.
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How is the equilibrium of 21% oxygen in Earth's atmosphere established?
The atmosphere is 21% oxygen. I assume that there must be an equilibrium between processes that produce oxygen (e.g. photosynthesis) and those that consume oxygen (e.g. aerobic respiration).
Moreover,...
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Causes of fluctuations in atmospheric oxygen in past 300 Mya
I have two questions based on the history of atmospheric oxygen levels depicted below.
Source: https://commons.wikimedia.org/wiki/File:Sauerstoffgehalt-1000mj2.png.
The notes below the chart explain ...
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Why cannot people burn all the atmospheric oxygen? [closed]
We are told that photosynthesis, developed a couple of billion years ago has produced all the atmospheric oxygen. I wonder, why did the process stop? Why do modern plants prefer to recover the entropy ...
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Why limestone formation was not a concern in atmosphere oxidation event? [closed]
I have just got to know why Fe was a problem. After clay (alumnum) and Silicon got oxidized, there has left a lot of unoxidized Fe in the crust, whose oxidization has finished during GOE. But, ferrum ...
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Is oxygen the most abundant element on Earth?
When I was in school, I was taught that we need oxygen to breathe, but it actually constitutes only a small fraction of the atmospheric composition, and that nitrogen constituted the largest fraction ...
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Percentage of Oxgen left after burning all the available biomass
A documentry stated that during the Permian asteroid strike the atmosphere heated up to above 400C, potentially to 600C. As this would ignite most of the biomass, including us, I wondered if this fire ...
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Why is Great Oxidation Event associated with Iron oxidation but not Aluminum or Silicon?
Just to build up on my previous success with oxygen origin in the atmosphere, I want to expand the question as was advised in the answers. The official heresy, despite denied in the comments and ...