Across
- 1. Formed when 2 oceanic plates pull away from each other
- 3. Part of the Earth's mantle
- 6. The theory that the sea floor is slowly expanding
- 7. Created the theory of tectonic plates
- 8. A set of volcanoes
- 9. A magnetic force created by the Earth
- 10. A sudden movement that causes intense shaking
- 11. When 2 tectonic plates slide past each other
- 20. Created the theory of seafloor spreading
- 22. Layers that move and reshape easily
- 25. Relating to sound
- 29. When 2 tectonic plates push against each other
- 30. A dark iron-rich igneous rock
- 32. When 2 tectonic plates push away from each other
- 33. When a tectonic plate moves under another
- 34. Part of the Earth's crust
- 35. Liquified through heat
- 37. A landmass that existed long ago
- 39. The theory that the Earth is divided into sections
- 40. A material that is easy to reshape
- 41. A steep area of the ocean
Down
- 2. The part of the Earth's surface that is made of land
- 4. Layers that don't change easily
- 5. The sea floor expands from this point
- 12. Waves that travel through the Earth
- 13. A shell outside of the inner core
- 14. Dense lava
- 15. A process that can determine rock, fossil, or layer ages, find past locations of continents, and learn about the magnetic field
- 16. Plates pushing outwards
- 17. The theory that continents move over time
- 18. Lava
- 19. A type of rocky material
- 21. Hard to move out of position
- 23. When one continental plate and one oceanic plate collide and push against each other, this forms
- 24. A layer in the center of the Earth
- 25. When one tectonic plate goes under another
- 26. Surface made out of water
- 27. A layer of the Earth under the crust
- 28. A section of the Earth
- 31. An event where the magnetic field turns around
- 36. A strong, lower part of the Earth's mantle
- 38. The top layer of the Earth