Multiple choice general knowledge science & technology Ozone hole refers to hole in ozone layer decrease in the ozone layer in troposphere decrease in thickness of ozone layer in stratosphere increase in the thickness of ozone layer in troposphere Reveal answer Fill a bubble to check yourself C Correct answer Explanation The ozone hole refers to the thinning of the ozone layer in the stratosphere, particularly over Antarctica. It is not an actual hole but a decrease in thickness of the ozone layer in the stratosphere. Option C is correct.