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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.
The epidermis is the outermost layer of our skin. Its main purpose is protection. The epidermis is made of four main layers, or strata 1  : The stratum corneum is the thick, tough outer layer. 2  It is made mostly of dead cells that slough off constantly. 3  The stratum basale is comprised of new cells that are constantly dividing to replace the stratum corneum.