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The ozone molecule is unstable (although, in the stratosphere, long-lived) and when ultraviolet light hits ozone it splits into a molecule of O 2 and an individual atom of oxygen, a continuing process called the ozone-oxygen cycle.
Ozone gas protects the Earth's surface from UV-B radiation (which damages DNA). Ozone also moderates day / night temperature swings, and to couple nitrogen and oxygen temperatures to radiate away some of their heat (they cannot radiate in infrared, but ozone can).