Depletion means the disintegration or loss of something. Ozone is what
makes up one of the protective layers of the planet Earth which shields
organisms from the full impact of the Sun. Ozone depletion is the loss
of the protective layer between the Sun and Earth.
The ozone layer is a layer in Earth's atmosphere which contains
relatively high concentrations of ozone (O3). This layer absorbs 93-99%
of the sun's high frequency ultraviolet light, which is potentially
damaging to life on earth. Over 91% of the ozone in Earth's
atmosphere is present here. It is mainly located in the lower portion
of the stratosphere from approximately 10 km to 50 km above Earth,
though the thickness varies seasonally and geographically.
Ozone depletion Main article: Ozone depletion NASA projections of stratospheric ozone concentrations if chlorofluorocarbons had not been banned.