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State two forms in which the elemental oxygen is found in the earth’s atmosphere. Mention in brief the essential function performed by each at the place

they are found. What are CFCs and why are these considered harmful for the life on the earth?


Ozone and oxygen (O2) Ozone prevent harmful ultraviolet suns radiation from reaching earths surface CFC are chloro Fluro carbon They create a hole in ozone layer which allows UV rays to e Reach earth So CFCs are harmul
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