How do scientists know when oxygen first appeared in
the Earth's atmosphere?
The mass extinct...
Chemistry, 04.06.2021 09:00 matthewboeckman6831
How do scientists know when oxygen first appeared in
the Earth's atmosphere?
The mass extinction of Archaea.
The decrease of CO2 in the Earth's atmosphere.
o The formation of snowball Earth.
o The appearance of red banded sedimentary rock
which was produced when oxygen reacted with and
precipitated dissolved iron in the oceans.
Answers: 1
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