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This activity (on page 2 of the PDF under SciGirls Activity: Music and Sound) is a full inquiry investigation into sound frequency.

$5 - $10 per group Ages 8 - 14 1 to 2 hours

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With a straw, two craft sticks, and some rubber bands, construct a noisemaker called a Sound Sandwich and explore how vibration produces sound.

1 cent - $1 per student Ages 8 - 14 10 to 30 minutes