_____ is present in very small proportion in the upper atmosphere and acts as a shield from harmful _____ radiation of sun.
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Ozone is present in very small proportion in the the upoer atmosphere and acts as a shield from harmful uv radiation of sun
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ozone
About 90% of atmospheric ozone is contained in the stratospheric “ozone layer”, which shields Earth's surface from harmful ultraviolet radiation emitted by the Sun.
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