| A | B |
|---|
| Vibration | The back and forth movement that makes sound |
| Volume | The loudness or softness of a sound |
| Pitch | The highness or lowness of a sound |
| Reflected sound | Sound that changes direction or movement |
| Echo | An example of a reflected sound |
| Communication | The sending of messages |
| Vocal chords | Special flaps of muscle that vibrate when you talk |
| Decibels | The name of the unit used to measure the intensity of sound ex. Breathing - 0 decibel. Fireworks - 140 decibel |
| Sound | Sound is vibration. Energy must be used to produce sound. Ex: plucking strings on a guitar. Blowing of a trumpet. |
