Sound
ears detect sound
ear drum
vibrations
air
solids
liquids
bouncess
echo
echo location
dolphins
bats
submarines
energy
wave
longitudinal
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the vibrations from the speaker make the sand that was on the cardboard on the speaker bounce up and down.
and oscilloscope allows you to see sound waves.
the higher the top curve the bigger the amplitude, the greater the amplitude the greater the sound.
the higher pitch the shorter the waves, the lower the pitch longer the waves.