Across
- 3. the height of a wave
- 5. how high or how low a sound is when you hear it
- 8. the way sounds travel in an up-and-down pattern
- 10. a sound that bounces off a surface and travels back to someone's ears
- 11. an empty space without any air
- 13. a quick movement back and forth
- 14. to take a code and change it to a different form that can be understood
Down
- 1. vibrations that you can usually hear with your ears
- 2. a measure of how many waves go by you in a set amount of time
- 4. something that happens again and again and again in a way that can be predicted
- 6. a system of words, letters, or other symbols that stand for other words, letters, or symbols
- 7. a form of energy, such as what usually powers light bulbs
- 9. a device that shows wave patterns
- 12. a part of the ear that vibrates to help us hear sounds