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Ultraviolet Radiation is basically a form of radiant energy that comes from the sun The various forms of energy or radiation are classified according to wavelength measured in nanometers one nanometer is a millionth of a millimeterOzone Depletion page 2 The shorter the wavelength the more energetic the radiation In order of decreasing energy the principal forms of radiation are gamma rays X rays UV ultraviolet radiation visible light infrared radiation microwaves and radio waves Ozone Depletion page 2 There are three categories of ultraviolet radiation and they are UV-A between 320 and 400 nanometers UV-B 280 and 320 nanometers and UV-C between 200 and 280 nanometers Ultraviolet radiation is mostly harmful some of the worst points are when the wavelength is at its shortest It can do major biologically damage if it reaches the earth in sufficient quantity UV-A is the least damaging form of UV radiation and reaches the Earth in greatest quantity Most UV-A rays pass right through the ozone layer UV-B radiation is potentially very harmful Fortunately most of the suns UV-B radiation is absorbed by ozone in the stratosphere UV-C radiation is potentially the most damaging because it is very energetic Fortunately all UV-C is absorbed by oxygen and ozone in the stratosphere and never reaches the Earths surface To summarize the harmful effects of ultraviolet rays one can only figure that the danger from ultraviolet radiation comes mainly from the UV-B range of the spectrum although UV-A poses some risk if exposure is long enough There is not very many things that can save the Earth from UV rays except for the stratosphere A few factors that make a difference in the effects of UV rays on your area are Latitude Season Time of Day Altitude Cloud cover Rain Air pollution and Land cover Since the suns rays impact the Earths surface at the most direct angle over the equator they are the most intense at this latitude
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