Waves

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Across
  1. 5. Change in position
  2. 7. The path to go somewhere
  3. 8. The title of this crossword
  4. 9. Smallest unit of matter
  5. 12. Amount of force applied to something
  6. 14. The distance between wave crests
  7. 17. Form of a circle
  8. 18. The earth is mostly made up of this
  9. 20. Relates to heat
Down
  1. 1. Lacks depth
  2. 2. sensation of hearing
  3. 3. How often something happens
  4. 4. Anything that takes up space
  5. 6. A back-and-forth motion
  6. 10. Mass in motion
  7. 11. Extending or lying across
  8. 13. Another word for air
  9. 15. Two lines intersecting at a point
  10. 16. Ability to do work
  11. 19. The height of a wave