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The ozone layer protects us against harmful solar ultraviolet radiation. Ozone in the stratosphere absorbs some of the Sunâs biologically harmful ultraviolet radiation. Most of the short-wave radiation (so-called UV-B) is absorbed by the ozone layer, whereas long-wave UV (so-called UV-A) passes through the ozone layer and reaches the ground.
Human skin has an outer, protective layer called the acid mantle. This skin barrier is a thin, acidic film that keeps bacteria out of the skin cells.he acid mantle is the outer, protective layer found on human skin. To avoid damage to the acid mantle, always wear a sunscreen with a high sun protection factor (SPF).