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UV rays cause cancer but in stratosphere the how same UV rays are helping us?

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They divert harmful UV rays back to sun

They convert oxygen in stratosphere into ozone.

UV rays are not present in stratosphere

UV rays reach the earth surface then bounce back carrying ozone to stratosphere

answer is B.

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Detailed Solution

Ozone at higher levels of the atmosphere is a product of UV radiations acting on oxygen molecule $(O_{2})$

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Higher energy UV radiations split some molecular oxygen into free oxygen atom (nacent oxygen) (O).

$↓$

These atoms being highly reactive combine with the molecular oxygen to form Ozone.

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