Sound waves

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Across
  1. 1. Anything that can be weighed or takes up space
  2. 7. Type of matter with a firm shape
  3. 9. Notice what is happening
  4. 11. Type of matter less dense then a solid but more dense then gas
  5. 14. A carful examination or search
Down
  1. 2. How loud or quiet a sound is
  2. 3. Type of matter with no fixed shape or fixed volume
  3. 4. To mimic or model an observation
  4. 5. At the bottom of the range of sound
  5. 6. How often something happens
  6. 8. A group of atoms bonded together
  7. 10. An electronic that converts eletrical audio signals into corresponding sound
  8. 12. A visual representation of typically two variables
  9. 13. At the top of the range of sound
  10. 15. Vibrations that travel through air