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