sound and space

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Across
  1. 3. has genetic code for particular trait
  2. 4. centimeters that plates move each year
  3. 6. sperm and eggs are these
  4. 8. the bottom of a wave
  5. 9. differences in individuals of same species
  6. 10. displays waveforms of sound
  7. 12. northern most plate
  8. 14. amplitude increases when waves meet
  9. 20. these were found on multiple plates
  10. 22. above and below the equator
  11. 24. formed after fertilization
  12. 25. have two X chromosomes
  13. 26. theory that Theia struck Earth
  14. 27. peaks of wave A meet troughs of wave B
Down
  1. 1. clouds of dust and gas in space
  2. 2. measure of pitch
  3. 5. plate contains much of Europe and Asia
  4. 7. pertaining to stars
  5. 11. nebulae that can be seen
  6. 13. when waves meet each other
  7. 15. tightly wound DNA
  8. 16. distance of a wave from the midline
  9. 17. type of heat transfer that moves the crust
  10. 18. is measured by the amplitude
  11. 19. the unit for frequency
  12. 21. plates that drift on the mantle
  13. 23. the top of a wave