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The front of this poster is a cartoon profile of the atmosphere, showing the "good and bad" roles of ozone in the stratosphere, high troposphere, mid-troposphere, and surface. On the back is an article for students, beginning with an explanation of ozone's roles, and an introduction to spectroscopy. Also includes detailed instructions for building a classroom spectroscope using a CD or a DVD as a diffraction grating. See related resources to download a PDF file that is a pattern for making the spectroscope body out of construction paper.