Plate tectonics

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Across
  1. 3. the rigid part of the earth in between the crust and the upper mantle
  2. 4. the layer of soft, rock underneath Earths plates
  3. 6. something we observe to be similar over and over again
  4. 8. the last name of the person that came up with continental drift
  5. 10. Earths outer layer
  6. 15. what they call the “plastic” layer
  7. 16. moving apart in different directions
  8. 19. a sudden shaking of Earths surface
  9. 20. Earths innermost layer
Down
  1. 1. a landform that forms when plates move apart
  2. 2. the sudden pushing out of something
  3. 5. the element that makes up most of Earths core
  4. 7. to examine in detail for a purpose
  5. 9. how often of fast something is moving
  6. 11. the process in plate tectonics of the edge of one plate descending below the edge of another plate
  7. 12. one of the very large sections of hard solid rock, that make up Earths outer layer
  8. 13. an long deep indentation in the ocean floor form when 2 plates move together
  9. 14. moving towards the same place
  10. 17. the number of main plates on earth
  11. 18. the thing that increases the further down you go in the earth