Plate Tectonics

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Across
  1. 4. Person who studies rocks
  2. 6. Period of time
  3. 8. Largest unit of geological time
  4. 10. In reference to the oceans
  5. 13. Very old
  6. 14. Solid substance that occurs naturally
  7. 16. Region of the Earth where organisms exist
  8. 18. Earth's outer crust
  9. 19. The process of covering the Earth's surface with ice
Down
  1. 1. One of earth's large landmasses
  2. 2. Sudden volcanic discharge
  3. 3. Caused by earthquakes or volcanic activity
  4. 5. Molten lava on the Earth's crust
  5. 7. Phenomena associated with volcanic activity
  6. 9. Crash together with violent impact
  7. 11. Not flexible, unable to bend
  8. 12. To reduce to a liquid state
  9. 15. Relates to the movement of the Earth's crust
  10. 17. To become separated