Radiation ultraviolet
.Electromagnetic wave with frequency higher than the light is radiation ultraviolet in nature. ส่วนใหญ่มาจาก sun.Found in the ionosphere are molecules of various kinds, such as ozone, which can block the ultraviolet radiation ultraviolet cannot normally well through the barrier thickness. It can disinfect of some kind.But if the ultraviolet radiation from the sun sent down to earth in any country, too. Large population in that country may skin cancer. Because of excessive radiation doses.
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