2. How Sound is Produced Brass Vibrating Air Woodwinds Vibrating Reed Percussion Vibration Surface Strings Vibrating Strings

3. Vibration -a back and forth motion. How sound is produced- Sound Waves –a vibration that spreads away from a vibrating object.

4. The guitar’s strings make a pitch. The thicker the strings the lower the sound. The skinnier the string the higher the sound. The thicker string vibrates longer because it has no room to move around.

5. Compression - The part of a sound wave where the molecules are crowded together. Rarefaction - The part of a sound wave where the molecules are spread apart.

6. Solids -A form of matter that has a definite shape and takes up a definite amount of space. Liquids –a form of matter that takes up a definite amount of space but has no definite shape. Gases -a form of matter that does not take up a definite amount of space and has no definite shape.