« on: 12/11/2017 21:01:07 »
Oxygen is the third most abundant element in the cosmos, after hydrogen and helium. So far I know you can't breath on Mars and the Moon. So where is all the oxygen hiding?Given that it is the second most abundant element making up the Earth I don't think we should describe it as hiding. The bulk of the Earth's mass is present in the silicate mantle that, as pointed out by evan_au, contains abundant oxygen. It's almost as abundant, to a % or two, as iron.
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