| A | B |
|---|
| sound | a form of energy produced by vibrating objects |
| vibrations | a rapid movement back and forth |
| decibels | the unit used to measure volume of sound |
| pitch | the sense of a high or low number of vibrations |
| compression | a pressing together |
| rarefaction | a relaxing or releasing of pressure |
| volume of sound | how soft or loud a sound is |
| sonar | the use of sound waves to locate objects |
| echo | the bouncing of sound waves |
| speed of sound | 345 meters per second or about 750 miles per hour |
