Sounds are fluids that travel through air. Sounds are waves that travel through matter. Sounds are gases that transform into vibrations. Sounds are forms of energy that are converted from light.
I gave my students this multiple choice question: Paul listens to music through his radio. Which best explains the sound Paul hears?

Only one answer is correct among these 4 choices:
- Sounds are fluids that travel through air.
- Sounds are waves that travel through matter.
- Sounds are gases that transform into vibrations.
- Sounds are forms of energy that are converted from light.

Could you tell me which one is correct?

Sounds are waves that travel through matter.