Ozone absorbs ultraviolet light. Nitrogen reflects ultraviolet light. Water vapor scatters ultraviolet light. Carbon dioxide blocks ultraviolet light.
I gave my students this multiple choice question: What process in the atmosphere protects people from the ultraviolet rays in sunlight?

Only one answer is correct among these 4 choices:
- Ozone absorbs ultraviolet light.
- Nitrogen reflects ultraviolet light.
- Water vapor scatters ultraviolet light.
- Carbon dioxide blocks ultraviolet light.

Could you tell me which one is correct?

Ozone absorbs ultraviolet light.