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OZONE LAYER. • The ozone layer is a layer in Earth's atmosphere which contains relatively high concentrations of ozone (O3). • This layer absorbs 97–99% of the Sun's high frequency ultraviolet light, which potentially damages the life forms on Earth. • It is mainly located in the lower portion of the stratosphere from approximately 20 to 30 kilometres above Earth. • Created by ultraviolet light striking oxygen atoms (O2), splitting them into individual oxygen atoms (atomic oxygen); • The atomic oxygen then combines with unbroken O2 to create ozone, O3 OZONE LAYER DEPLETION. • The ozone layer can be depleted by free radicals hydroxyl (OH-), chlorine (Cl-), bromine (Br-). chlorofluorocarbons (CFCs) and bromofluorocarbons EFFECTS OF OZONE DEPLETION. • More ultraviolet light from the sun can reach the Earth. • UV increase can cause skin cancer, cataracts (snowblindness or photokeratitis), and suppression of the human immune system. • In addition to cancer, some research shows that a decreased ozone layer will increase rates of malaria and other infectious diseases. • Oceans will be affected as well. The most basic microscopic organisms such as plankton may not be able to survive. • Climate changes. Melting of glaziers (rising sea levels)