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Sound (What is volume? (Loud sound (a lot of energy (can travel far (can…

- - - - can travel far
        
        can hear from far away
  - - - cannot travel far
        
        stand close to hear
- - - - vibrates when you talk
    - - 1) travels through air
      - 2) reaches your ear
      - 3) vibrates eardrums
      - similar to water waves
        
        water waves: visible
        
        sound waves: invisible
- - - - bounces off objects
        
        echo: a sound that is a copy of another sound
        
        ex) bats (echolocation)
      - some can be absorbed
        
        use objects to block the sound
        
        closing the door when talking
        
        wearing earplugs
    - - whales communicate underwater