Discussion
The ozone layer at high altitude contains
Answer: C
The ozone layer is not pure ozone. It is a mixture of atomic oxygen (O), ordinary molecular oxygen (O2) and ozone (O3), all three interconverting continuously.
Ultraviolet light splits O2 into two O atoms, each of which joins another O2 to make O3; ultraviolet then splits the O3 again. It is this endless cycle that absorbs the harmful radiation.
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