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        6-12

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        Auditory, Visual

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        Changes in the Ozone Layer

        This ThinkTV segment describes how the ozone layer is formed in the upper atmosphere, and how it serves to protect organisms from harmful ultraviolet rays. Depletion of the ozone, a process which began in the 1970s, was caused by CFCs. Today, the holes in the ozone layer appear to be shrinking.

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