Earth Science

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Across
  1. 2. All of earth [large original landmass]
  2. 3. Oceanic disturbance caused by tectonic activity
  3. 5. Outer layer of the planet
  4. 7. Seafloor spreading theory
  5. 10. Gas and mud explosion from a volcano
  6. 12. The less dense tectonic plate
  7. 14. Explosive volcano
  8. 16. The hard upper mantle and crust
  9. 17. Contintental drift theory
  10. 19. Molten rock below ground level
Down
  1. 1. The more dense tectonic plate
  2. 4. Non-explosive volcano
  3. 6. Boundaries coming together
  4. 8. To go under
  5. 9. Boundaries going apart
  6. 10. Molten rock above ground level
  7. 11. The central passage in a volcano
  8. 13. Boundaries slipping past
  9. 15. Caused by magnetic changes
  10. 18. Violent ground shaking
  11. 20. The lower plastic mantle