A) hole in the ozone layer in stratosphere.
B) decrease in the thickness of ozone in the stratosphere.
C) decrease in concentration of ozone in trophosphere.
D) increase in the concentration of ozone in trophosphere.
Correct Answer: B
Solution :
[b] Ozone layer is present in the stratosphere in the atmosphere of the earth. It protects the earth from UV rays (less than 300 nm). Hole in the ozone layer means thinning of ozone layer that allows harmful UV rays to reach earth which cause skin diseases.
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