Which of the following is extensively used as a refrigerant?

Ozone is used in swimming pools because

Given below are two statements.
Statement $I$: Absorption of $UV$ radiations is directly proportional to the thickness of ozone.
Statement $II$: Ozone is generated by absorption of shorter wavelength of infrared radiations.
In the light of the above two statements,choose the correct answer from the options given below.

The full form of $CFCs$ is . . . . . . .

$CFCs$ are responsible for:

Ozone layer depletion or a hole in the ozone layer is primarily found over which region?