Across
- 1. Moving back and forth quickly.
- 4. A form of a solid, liquid, or gas.
- 6. The absence of matter which light waves can travel through.
- 9. The way waves travel that need a medium to travel through.
- 10. Regions of a wave where air particles are close together.
Down
- 2. Part of the wave where air particles are furthest apart.
- 3. Waves that particles move up and down in a perpendicular way.
- 5. Waves that air particles push into air particles and go in a parallel movement.
- 7. How high or low a sound is based off by how fast particles are vibrating.
- 8. A type of energy that vibrates back and forth.