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How is oxygen found in?
Oxygen was discovered about 1772 by a Swedish chemist, Carl Wilhelm Scheele, who obtained it by heating potassium nitrate, mercuric oxide, and many other substances.
Is oxygen naturally found?
Oxygen is found naturally as a molecule. Two oxygen atoms strongly bind together with a covalent double bond to form dioxygen or O2.
Where is oxygen most abundant on Earth?
crustOxygen is the third most abundant element in the universe after hydrogen and helium (by mass) and it's the most abundant element (by mass) in the Earth's crust, making up almost half of the crust's mass.
Why is oxygen found on Earth?
Oxygen first appeared in the Earth's atmosphere around 2 billion years ago, accumulating from the photosynthesis of blue-green algae. Photosynthesis uses energy from the sun to split water into oxygen and hydrogen. The oxygen passes into the atmosphere and the hydrogen joins with carbon dioxide to produce biomass.