| A | B |
|---|
| sound | vibrations that move through air |
| vibrate | to move quickly back and forth |
| volume | the loudness or softness of a sound |
| pitch | how high or low a sound is |
| echo | a sound that bounces back from an object |
| sound wave | regular pattern of vibrations that move through the air or other materials |
| frequency | the number of times an object vibrates in one second |
| vocal cords | two pairs of thin, ropelike flaps at the top of the windpipe |
| eardrum | thin skin that covers the middle part of the ear and vibrates when sound waves reach it |
| nerve | part of the body that carries messages to the brain |
| tuba | an example of a low pitch (slow) |
| flute | an example of a high pitch (fast) |
