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Line 1: − UVB is a band of ultraviolet radiation with wavelengths from 280-320 nanometers produced by the [[Sun]]. − UVB is a kind of ultraviolet light from the sun (and sun lamps) that has several harmful effects. It is particularly effective at damaging DNA. Some consider it to be a cause of [[melanoma]] and other types of skin cancer. − − The ozone layer protects the Earth against most UVB coming from the sun. It may also be helpful minimize one's exposure to UVB by wearing hats, sunglasses, and sunscreen. − − [[category:physics]]
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