Ozone layer depletion refers to the slow and steady decline of the ozone concentration in the earth's atmosphere.
Cause of ozone layer depletion:
Major cause of ozone layer depletion is the widespread use of chlorofluorocarbons(CFS's).
Chlorofluorocarbons (CFS's) used is aersols sprays, refrigerators and air conditioners cause the depletion of the ozone layer in the atmosphere.
The ozone layer absorbs most of the harmful ultraviolet rays of the sun and prevents them from reaching the earth's surface. But due to the decrease in the concentration of ozone in the air, the harmful ultraviolet rays can enter the earth's lower atmosphere to cause skin cancer, cataract in the eyes, sunburn, etc..
It can also increase the erath's temperature, leading to the global warming.