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character: Ozone Layer
topic: The Role of Ozone in Protecting Earth from UV Radiation
grade: 11
subject: Chemistry
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character: Ultraviolet Radiation
topic: Effects of UV Radiation on Human Health and the Environment
grade: 11
subject: Chemistry
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character: CFCs (Chlorofluorocarbons)
topic: Impact of Human Activities on the Ozone Layer
grade: 11
subject: Chemistry
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character: Stratosphere
topic: The Structure of the Atmosphere and Its Layers
grade: 11
subject: Chemistry
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