Questions tagged [oxygen]
Questions regarding the 8th chemical element, a main component of the athmosphere and of the crust.
22
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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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votes
2answers
6k views
Is oxygen spread equally on Earth's surface?
We know that oxygen comes from trees and plants (photosynthesis), so in the jungle where there are a lot of trees you would expect more oxygen than in the desert where there are no trees. Walking in ...
2
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2answers
62 views
How many mole of oxygen gas is there in the atmosphere?
At standard conditions, one liter of air, 0.21 L of oxygen gas, contains 0.0094 moles of $\rm O_2$. What is the total quantity of oxygen gas molecules in the atmosphere?
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1answer
18 views
Filtered pressured oxygen 80 miilion years ago
Was dinosaur blood really red? Was the vegitation really green?Can that filter be used today?
2
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2answers
124 views
What is the history of atmospheric O₂ concentration?
(This is about O₂, not CO₂)
How did the concentration of oxygen change?
Over geologic time frames since plants began to produce it,
and during the time since the carbon dioxide increase caused by ...
2
votes
1answer
76 views
Why does atmospheric oxygen remain so “constant”? [duplicate]
I've always wondering why the oxygen in the atmosphere remains so perfectly at the level required for air-breathing life. What causes it to remain so perfect?
Also, a side question, why aren't their ...
4
votes
3answers
346 views
Why is it said that Amazon creates 20% of the oxygen production of the world, when it accounts with less than 14-12.8% of the forest area?
Many times we see in articles that the Amazon rainforest creates 20% of the oxygen of the world . Even french president Macron stated this in a tweet Macron tweet
According to this Amazonas size ...
4
votes
1answer
861 views
Which plant produces the most oxygen?
Which plant is the most efficient in making oxygen for it's weight? I want to think it is the greenest plant with more leaves and least ...
3
votes
1answer
326 views
What rate of deforestation would be needed until we run out of oxygen?
I was wondering about how much unchecked deforestation would have to occur before we tipped the balance and started using more oxygen than was being replenished by plants and trees.
Last I heard it ...
16
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2answers
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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,...
5
votes
2answers
411 views
Why did the carboniferous period have so much atmospheric oxygen?
Even if all the carbon dioxide (which makes up less than 1% of the atmosphere) in the air were sequestered by plants, would the atmosphere not remain about 21% oxygen? Why did the carboniferous period ...
5
votes
1answer
58 views
Are there any consequences to carbon capture and storage that also sequesters oxygen?
A big argument for carbon capture and storage is true reversal; while switching to renewable energy and eliminating CO2 emissions is a must, it will not reverse the massive movement of carbon from ...
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2answers
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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 ...
9
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1answer
2k views
When did wildfires start to occur on earth?
An oxidizer, fuel, and heat are needed for a fire. When considering oxygen as the oxidizer, an oxygen concentration of approximately 16% is required for combustion. Plant material is the fuel ...
2
votes
1answer
164 views
Could earth run out of O2? [closed]
Death in a closed environment due to lack of O2 is actually not that bad:
https://www.youtube.com/watch?v=kUfF2MTnqAw
And as far as I know as we are cutting down our life saving woods and jungles ...
4
votes
1answer
140 views
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 ...
4
votes
1answer
133 views
Difference between the oxygen/$CO_2$ ratio during the period of the dinosaurs and the present
Here's the base of my question: Was volcanic activity more prevalent when the dinosaurs roamed?
Is it true that during the time of the dinosaurs, both the oxygen requirements (by all living creatures ...
3
votes
1answer
228 views
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 ...
1
vote
1answer
321 views
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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votes
2answers
566 views
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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vote
0answers
66 views
Locate people by Oxygen/Carbon Dioxide levels [closed]
I've been challenged to think of some really out-of-the-box ways to locate people, and I had one. I'm 90% sure this isn't reasonably possible (probably only in laboratory settings), but I couldn't ...
4
votes
2answers
251 views
How is there enough $\ce{O2}$ in the atmosphere to breathe if you are in a desert with no plants?
Humans depend on $\ce{O2}$ for breathing. The source of $\ce{O2}$ is photosynthesis by plants or cyanobacteria in the ocean.
How is it, that when people travel through deserts or the Arctic / ...
