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    How did the earth get oxygen?
    To ask more specifically: What happened on earth to create enough oxygene for animals such as man to live here? And when did this happen?

    Question #74529. Asked by author. (Jan 14 07 5:49 PM)


    zbeckabee

    		"Unbound oxygen (also called molecular oxygen, or dioxygen, O2, a diatomic molecule) first appeared in significant quantities on Earth during the Paleoproterozoic era (between 2.5 billion years ago and 1.6 billion years ago) as a product of the metabolic action of early anaerobes (archaea and bacteria). The presence of large amounts of free oxygen may have driven most of the organisms then living to extinction.[citation needed] The atmospheric abundance of free oxygen in later geological epochs and its gradual increase up to the present has been largely driven by photosynthetic organisms; roughly three quarters of the free element being produced by algae in the oceans, and one quarter from terrestrial plants."


    http://en.wikipedia.org/wiki/Oxygen

    Jan 14 07, 9:23 PM

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