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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 absorbs UV-B. UV-B would otherwise damage the DNA of all DNA-based life on / near Earth's surface. ozone is the chemical in our atmoshere that traps heat from the sun. It acts as a greenhouse, sunlight can come in but it can't go out.