Lasted edited by Andrew Munsey, updated on June 15, 2016 at 1:39 am.
Oxygen is a There was an error working with the wiki: Code[2]
or There was an error working with the wiki: Code[3]
bonded to other elements.
Unbound oxygen (also called molecular oxygen, or dioxygen, O2, a There was an error working with the wiki: Code[4]
) first appeared in significant quantities on Earth during the There was an error working with the wiki: Code[5]
era (between 2.5 billion years ago and 1.6 billion years ago) as a product of the There was an error working with the wiki: Code[6]
action of early There was an error working with the wiki: Code[7]
s (There was an error working with the wiki: Code[8]
and There was an error working with the wiki: Code[9]
). The presence of large amounts of free oxygen may have driven most of the organisms then living to extinction.There was an error working with the wiki: Code[1]
The atmospheric abundance of free oxygen in later geological epochs and up to the present has been largely driven by There was an error working with the wiki: Code[10]
organisms roughly three quarters of the free element being produced by There was an error working with the wiki: Code[11]
in the oceans, and one quarter from terrestrial There was an error working with the wiki: Code[12]
s.
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