The correct answer is C. mixture of atomic oxygen (O), ordinary oxygen (O2) and Ozone (O3).
The ozone layer is a region of Earth’s stratosphere that absorbs most of the Sun’s ultraviolet radiation. It contains high concentrations of ozone (O3) relative to other parts of the atmosphere, although still small in relation to other gases in the stratosphere. The ozone layer contains less than 10 parts per million of ozone, while the average ozone concentration in Earth’s atmosphere as a whole is about 0.3 parts per million. The ozone layer is mainly found in the lower portion of the stratosphere, from approximately 20 to 30 kilometers (12 to 19 mi) above Earth, although its thickness varies seasonally and geographically.
The ozone layer was discovered in 1913 by French physicists Charles Fabry and Henri Buisson. They found that the stratosphere contained a layer of ozone that absorbed ultraviolet radiation. The ozone layer is important because it protects life on Earth from harmful ultraviolet radiation. Ultraviolet radiation can cause skin cancer, cataracts, and other health problems. It can also damage plants and animals.
The ozone layer is constantly being created and destroyed. Ozone is created when ultraviolet radiation splits oxygen molecules (O2) into two oxygen atoms (O). These oxygen atoms then combine with oxygen molecules to form ozone (O3). Ozone is destroyed when it reacts with other chemicals, such as chlorine and bromine.
Chlorofluorocarbons (CFCs) are chemicals that were once widely used in refrigerators, air conditioners, and aerosol cans. CFCs are very stable and do not break down easily. When they reach the stratosphere, they are broken down by ultraviolet radiation and release chlorine atoms. These chlorine atoms react with ozone, destroying it.
The use of CFCs has been banned since the 1980s, and the ozone layer is slowly recovering. However, it is important to continue to protect the ozone layer by reducing our use of ozone-depleting substances.