Question

How is ozone formed in the upper atmosphere?

Answer 1

1. Oxygen gas (O₂) in the upper atmosphere absorbs ultraviolet (UV) rays from the sun.
2. The UV rays break O₂ molecules into individual oxygen atoms (O).
3. These oxygen atoms combine with O₂ molecules to form ozone (O₃).
4. This process is called photodissociation and recombination.
5. Ozone protects life by absorbing harmful UV radiation.