Question

how ozone layer is formed

Answer 1

Stratospheric ozone is formed naturally by chemical reactions involving solar ultraviolet radiation (sunlight) and oxygen molecules, which make up 21% of the atmosphere. In the first step, solar ultraviolet radiation breaks apart one oxygen molecule to produce two oxygen atoms

Answer 2

The UV rays break down o2 into two oxygen atom then a oxygen atom react with o2 to form ozone(o3)