Interior of the Earth

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Across
  1. 3. Least dense layer
  2. 4. second mechanical layer
  3. 7. Degree or intensity of heat
  4. 10. solid liquid gas
  5. 12. p wave
  6. 14. s wave
  7. 15. first mechanical layer
  8. 16. wave produced by earthquake
  9. 18. very dense layer
  10. 19. Created the planets
Down
  1. 1. layer of gas on earth
  2. 2. liquid layer
  3. 5. instrument that records earthquakes
  4. 6. force applied to an object
  5. 8. Second least dense layer
  6. 9. third mechanical layer
  7. 11. force that keeps objects on earth
  8. 13. Most dense mechanical layer
  9. 16. record produced from seismograph
  10. 17. compactness of a substance