SOUNDS AND THE EARTH

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Across
  1. 2. these are not present in a vacuum
  2. 3. the most common metal on the crust
  3. 6. this is the solid layer of the Earth aside from the crust
  4. 8. this is the liquid where tectonic plates move on top of
  5. 10. the name of the supercontinent that Wegener proposed was before continental drift
  6. 12. the thinnest layer of the Earth
  7. 13. sound waves travel best on _________ concrete
Down
  1. 1. the most common solid non-metal on the crust
  2. 4. this is where sound does not travel
  3. 5. this is the movement that causes sounds
  4. 7. this is the form of sound when it travels
  5. 9. when an object vibrates;it travels backwards and ____________
  6. 10. Sound can vary in loudness and ____________
  7. 11. this is the reflection of a sound wave
  8. 14. this layer is where molten rocks flow