Ozone Sign Video
Upload On Fri Aug 19 2011 by ASL STEM
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Definition
An unstable, poisonous allotrope of oxygen, O3, that is formed naturally in the ozone layer from atmospheric oxygen by electric discharge or exposure to ultraviolet radiation, also produced in the lower atmosphere by the photochemical reaction of certain pollutants.
Source: http://www.thefreedictionary.com/Ozone
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