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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 (O3) is a molecule made up of three oxygen atoms. It is formed from dioxygen (O2) molecules by the action of ultraviolet light and atmospheric electrical discharges. Ozone is always present in the Earth's atmosphere in low concentrations. In fact, it makes up 0.6 parts per million of the atmosphere.