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The most common state of oxygen is probably oxygen combined with metals and silicon such as molecules of silica which is sand and molecules of metal oxides like iron oxide. Aluminium oxides and Iron oxides and many other metal oxides make up most of the rocks and heavy material in the earth's crust. The sea contains a lot of oxygen as H2O which is water and the air is 20% oxygen, but the earth's crust weighs a lot more than the oceans and the air put together.

Therefore it is very likely that the rocky oxides hold most of the Earth's oxygen.

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