Down
| 2. | The rapid back-and-forth movement of matter. |
| 3. | A machine that sends out sounds waves and uses the waves that are reflected back. This is used to help detect underwater objects. |
| 4. | A structure in humans that contains the vocal cords and vibrates to produce sounds. |
| 7. | The distance between one crest or peak of a sound wave and the next crest or peak. |
| 8. | The bending of waves as they pass through an opening or around the edge of an object. |
| 10. | The pitch of a sound depends on the ____ of the sound wave. |
| 11. | The area where particles or air are pushed closer together as a result of being near something that is vibrating. |
| 12. | The bouncing back or change in direction of a wave after it strikes a barrier or an object. This may also be called an echo. |
| 13. | The loudness of a sound depends on the ____ of the sound wave. |
| 15. | A unit of frequency measured in cycles per second. |
| 16. | A sound that is repeated because the sound wave reflected or bounced back from a distant object. |
| 17. | The unit used to express loudness. |
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Across
| 1. | The form in which sound energy moves from one place to another. |
| 3. | A large bang caused by an aircraft flying at or faster than the speed of sound. (2 words) |
| 5. | A machine that converts an electrical signal into a sound wave with an increase in loudness. |
| 6. | A measure of the amount of energy that sound waves carry. |
| 9. | The part of the human body used for hearing. |
| 14. | A measure of the highness or lowness of a sound. |
| 18. | The peak of a sound wave where the greatest air pressure occurs. |
| 19. | Two or more sound waves that overlap. |
| 20. | A form of energy that travels as waves through the air and some solids and liquids. |
| 21. | The process of using reflected sound waves to find objects. Bats, dolphins, and some other animals use this to find food and avoid danger. |
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