Plate tectonics

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Across
  1. 2. mountain which can burst any time
  2. 5. Large aera of land
  3. 6. Relating to the ocean
  4. 9. Shaking of the ground
  5. 12. Supercontinent that includes all current landmasses
  6. 14. Part of Earth were living thing exist
  7. 16. slow movement of Earth's continents
  8. 18. Tectonic process
  9. 19. Thin, outer portion of the Earth
Down
  1. 1. Sound navigation and ranging
  2. 3. Very large aera of land
  3. 4. Black rock that comes from volcanos
  4. 7. Theory of global tectonics
  5. 8. something caused by an earthquake
  6. 10. Remains or trace of a living thing
  7. 11. German researcher geophysicst and metorologist
  8. 13. Thick, dence layer of rock that underlines Earth's crust
  9. 15. spreading: Process that occurs at mid-ocean ridges
  10. 17. San Andreas Fault line