UV rays cause cancer but in stratosphere the same UV rays are helping

1.	UV rays cause cancer but in stratosphere the same UV rays are helping us, how? (1) They divert harmful UV rays back to sun (2) They convert oxygen in stratosphere into ozone. (3) UV rays are not present in stratosphere. (4) UV rays reach the earth surface then bounce back carrying ozone to stratosphere.
Answer» (2) They convert oxygen in stratosphere into ozone. In stratosphere the ozone is formed naturally through the interaction of solar ultraviolet radiation with molecular O₂.

UV rays cause cancer but in stratosphere the same UV rays are helping us, how? (1) They divert harmful UV rays back to sun (2) They convert oxygen in stratosphere into ozone. (3) UV rays are not present in stratosphere. (4) UV rays reach the earth surface then bounce back carrying ozone to stratosphere.

Answer»

(2) They convert oxygen in stratosphere into ozone.

In stratosphere the ozone is formed naturally through the interaction of solar ultraviolet radiation with molecular O₂.

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