Earth's Systems Crossword Puzzle

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Across
  1. 4. All rock and land on Earth
  2. 5. The thinnest layer of the Earth
  3. 7. When two plates collide together
  4. 13. When two plates break apart from each other
  5. 15. The intact remains of an organism that has formed into rock over millions of years
  6. 18. The process of a liquid turning into a gas
  7. 19. All water on Earth
  8. 20. The center of the Earth
Down
  1. 1. Particles closely packed together that vibrate in place
  2. 2. The process of a solid turning into a liquid
  3. 3. Pieces of land on the Earth that move very slowly
  4. 6. The thickest layer of the Earth, which is made of magma
  5. 8. The process that turns liquid into a solid
  6. 9. The gas surrounding Earth
  7. 10. All life on Earth
  8. 11. All ice on Earth
  9. 12. Particles that are spread out and can move freely
  10. 14. When two plates slide past each other
  11. 16. Very hot molten rock
  12. 17. Particles that vibrate enough that they can slide past each other