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| Term | Description |
|---|---|
| Ozone | A triatomic form of oxygen that is a bluish gas of pungent odor, chemically very active; formed naturally in the upper atmosphere by a photochemical reaction with solar ultraviolet radiation. |
| Term | Description |
|---|---|
| Ozone | A triatomic form of oxygen that is a bluish gas of pungent odor, chemically very active; formed naturally in the upper atmosphere by a photochemical reaction with solar ultraviolet radiation. |