Ozone hole refers
a. hole in ozone layer
b. decrease in the ozone layer in troposphere
c. decrease in thickness of ozone layer in stratosphere
d. increase in the thickness of ozone layer in troposphere

The Correct Answer is A

Explanation:

ozone hole:

Extreme decreasing of ozone layer when more than share of the ozone vapor in a distinct region is exhausted, and damaging ultraviolet rays can cross through to arrive the earth's exterior.The ozone hole is not technically a “gap” where none ozone is available, but is a field of particularly exhausted ozone in the stratosphere above the Antarctic.