Define the following:

Ozone depletion

Ozone is a natural gas; it is an allotrope of oxygen consisting of three atoms of oxygen bound together in a non- linear fashion. The equilibrium between the formation and destruction of ozone has been upset by the influx of several substances into the atmosphere which reacts with and destroys it. The significant decrease in the concentration of ozone in a particular region of the atmosphere is called ‘ozone depletion’.