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1. What is Sound?

   • Vibrations
     • Pitch
       • Higher or lower sounds
       • Frequency
         • Rarefaction
         • Hertz (dB)
     • Loudness
       • Larger the vibrations, larger the sound

2. How does Sound Travel?

   • Energy passed through materials
     • Liquids
     • Solids
     • Gas
     • Layers of air between molecules
       • Compression
       • Rarefactions

3. How is Sound Produced?

   • Sound produced vibrations/vibrations produces sounds
     • String Instruments
     • Sound and glass
     • Tuning fork
     • Longitudinal Waves
     • Transverse Waves

4. How and what do we Hear?

   • Pleasant
     • For entertainment
       • Peaceful
       • Music
       • Melody
   • Unpleasant
     • Danger
       • Sirens
       • Alarms
       • Police
       • Ambulance
       • Safety
   • Ears
     • Humans
     • Animals
     • Anvil
     • Stirrup
     • Ear drum
     • Hammer
     • Ear canal