Across
- 4. made by man's inventions
- 6. make sound louder
- 10. a shell-shaped part of the inner ear filled with liquid
- 11. a unit used the measure the loudness of a sound
- 13. join the hairs in your ear to send signals to your brain
Down
- 1. found in nature
- 2. move back and forth many times each second
- 3. a device that uses high-pitched sound waves to take a picture through a person's skin
- 5. materials that absorb sound
- 7. a sound that bounces off an object and reflects back to the ear
- 8. how high or low a sound is
- 9. wave energy that vibrates particles as it travels through matter
- 12. a thin delicate membrane in the middle ear