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The Crust has the most oxygen in it
Your mom made the earths layers
Asthenosphere
there are 7 layers in earths mantle.
There are "layers" and there is a structure.
Most of earth's volume has been scientifically proved to be in the earth's mantle.
Outside your window, and with an Internet search for "atmospheric layers". The answer is the "troposphere". That's the lowest layer where most of the air is.
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No
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the crust
the crust