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Sound (What (a type of energy (heat, light), is made (when something…

- - - - vibrates
        
        when we talk
        
        our vocal cords vibrate
        
        when we hit a triangle
        
        the metal vibrates
  - - - something vibrates
        
        the wave reaches eardrums
        
        ear drums vibrate
        
        we can hear sound
- - - - whale
        
        communicate in the ocean
  - - - ex) closed door-> can't hear well
    - - echo
        
        happens when a sound bounces off something and comes back
        
        ex) bats- hunt and fly around