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ozone
The three-atom form of oxygen (O3) found in two layers of the Earth’s atmosphere. One layer of beneficial ozone occurs at 7 to 18 miles above the surface and shields the Earth from ultraviolet light. Several holes in this protective layer have been documented by scientists. Ozone also concentrates at the surface as a result of reactions between byproducts of fossil fuel combustion and sunlight, having harmful health effects.
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• ECOLOGY AND THE ENVIRONMENT
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