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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 is essential to life because it shields the Earth from the damaging, even lethal, ultraviolet radiation emitted by the sun. This filtering ability is particularly remarkable when you consider the relative scarcity of ozone molecules. For every billion molecules in the atmosphere, only around 300 are ozone.