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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.
The ozone layer is composed of ozone, a molecule made up of three oxygen atoms bonded together. Most of the ozone on Earth accumulates in the stratosphere, a layer of the atmosphere between 15 and 30 kilometers above the Earth's surface. The ozone layer prevents the heat energy reflected by the Earth's surface from being re-radiated into space. This process traps heat on the Earth and keeps it warm.