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The Ozone Layer Introduction Since the mid 1980's scientists have been aware of the continuing depletion occurring in the ozone layer. First discovered over the South Pole, these holes are thought to be the cause of excessive use of chlorofluorocarbons (CFC's, found in aerosols and refrigerators) and emissions from the petrochemical industry. Ozone (O?) itself is a highly reactive and unstable form of oxygen found in the stratosphere, but, while poisonous to humans if inhaled, it is also our natural defence against UV radiation. As people become more aware of this worsening problem and the effects of UV on the skin the demand for more effective chemical sunscreens has intensified - enter the chemists. Aim The aim of my investigation is to try different sun blocks of the same brand (differing factors) to test their UV blocking properties and attempt to identify the active ingredients used. I'll also test some household products for their UV blocking...

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