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Pronunciation:   O-zOn
Definition : Three oxygen atoms bond to form an ozone molecule. Ozone is good and bad for the earth.
Facts: In the stratosphere, a thin layer of ozone protects the planet from ultra violet (UV) radiation. (UV radiation can cause skin cancer.)

At the ground level, ozone helps to create smog. It can cause respiratory (breathing) problems in people.

The ozone layer isn't the same thickness all over the planet. It is usually thinner over the equator and thicker over the north and south poles.