Across
- 2. how high or low something is
- 4. sound is a type of
- 5. vibrations that travel through the air
- 6. absence of matter
- 9. the way waves travel
Down
- 1. causes something to make sound
- 3. form of a solid, liquid, or gas
- 7. a part of longitudinal wave
- 8. vibration of medium is parallel
- 10. air particles are farther apart