Across
- 1. Sudden shaking of the surface caused by release of energy in the lithosphere
- 5. Plates that slide horizontally past each other
- 9. Chains of undersea mountains
- 11. Reversal A flip of the Earth's magnetic field
- 13. Plates that come together with each other
- 15. Undersea valleys that are the deepest parts of the ocean
- 16. The outermost thinnest layer of the Earth
- 18. A theory that stated that the continents had once been fused together and over time they drifted apart
- 19. This theory states that Earth's lithosphere is broken up into plates
- 20. The thicker and less dense type of crust
Down
- 2. Plates in the lithosphere that consist of the Earth's crust and upper mantle
- 3. The denser and thinner type of crust
- 4. What oceanic crust is mostly made of
- 6. A process where the denser tectonic plate dives into the less dense plate
- 7. Continental crust is made of this
- 8. An ancient supercontinent that combined almsot all land into one supercontinent 200-230 million years ago
- 9. Protects us from sun radiation
- 10. Plates that move apart from each other
- 12. The thickest layer of the Earth, holding roughly 84% of the Earth's mass
- 14. Molten rock that flows up through a crack in the Earth's crust, and hardens on both sides of the crust.
- 17. A german meteorologist who created the continental drift theory