Question : Ultra violet radiations of the Sun do not reach the earth because, earth's atmosphere is surrounded by:
Option 1: Carbon dioxide
Option 2: Ammonia
Option 3: Chlorine
Option 4: Ozone
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Correct Answer: Ozone
Solution : The correct answer is ozone.
Ozone layer present in stratosphere protects the earth from the harmful ultraviolet radiations of the sun. It majorly absorbs the UV b and UV c radiations which is the most severe. Although it is transparent to UV A radiations. Its thickness is measured in Dobson Units. Ozone present in stratosphere is good ozone, while the ozone present in the troposphere is a pollutant. Chlorine, chlorofluorocarbons etc. are ozone depleting substance.
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