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SOUND (HOW MOVE? (bounce off and come back (ex) echo on mountains, ex)…

- - - - ex) whales communicate
- - - - a type of energy
        
        light or heat
  - - - vocal cords in throat
    - - metal
  - - - move back and forth
- - - - pushes the water
        
        visible
    - - invisible
  - - - eardrums vibrate
- - - - ex) a jackhammer, a car horn, a siren, a school bell
  - - - ex) a whisper, a squeaking mouse, a ticking clock