Oxygen is a chemical element and a gas, vital for Earth-like life and for terraforming processes. In nature, it is found in water and in oxides. Free oxygen is sometimes found in atmosphere of an Outer Planet.
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Oxygen is a chemical element and a gas, vital for Earth-like life and for terraforming processes. In nature, it is found in water and in oxides. Free oxygen is sometimes found in atmosphere of an Outer Planet.