Answer
Under the influence of UV radiation (UVB and UVC) from the sun, ozone molecules are being broken down into $O$ and $O_{2}$. However, this process can occur in two directions:
$O_{3}<=>O_{2}+O$
Ultraviolet radiation from the sun causes $O_{2}$ molecules to split into two atoms of oxygen:
$O_{2} -> O + O$
These atoms then react with other oxygen molecules and make $O_{3}$.
Work Step by Step
Under the influence of UV radiation (UVB and UVC) from the sun, ozone molecules are being broken down into $O$ and $O_{2}$. However, this process can occur in two directions:
$O_{3}<=>O_{2}+O$
Ultraviolet radiation from the sun causes $O_{2}$ molecules to split into two atoms of oxygen:
$O_{2} -> O + O$
These atoms then react with other oxygen molecules and make $O_{3}$.
