Plate tectonics and Seafloor Spreading

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Across
  1. 3. Study of earthquakes
  2. 4. Earth's solid outer layer
  3. 5. Vibrations caused by earthquakes
  4. 10. Scientist who studies rocks
  5. 11. Layer beneath the crust
  6. 17. Type of volcano with steep slopes
  7. 18. Break in Earth's crust
  8. 19. Molten rock beneath Earth's surface
  9. 20. Earth’s innermost layer
Down
  1. 1. Point inside Earth where earthquake begins
  2. 2. Large landmass
  3. 6. Circular volcanic opening
  4. 7. Solid mineral material
  5. 8. Scientist who studies rocks
  6. 9. Type of fault where blocks move horizontally
  7. 12. Earth's outer shell
  8. 13. Study of Earth's physical structure
  9. 14. Sudden shaking of the ground
  10. 15. Scale for measuring earthquakes
  11. 16. Hot molten rock