Plate Tectonics
Across
- 2. Scientist that proposed the continental drift theory.
- 5. Occurred when rocks that formed millions of years ago show the location of the magnetic poles at the time of their formation.
- 12. Weaker region in the mantle over which Earth's outer shell lies.
- 13. Surface feature created by a descending plate.
- 14. Earth's largest plate according to the plate tectonic theory.
- 16. Land consisting of an arc-shaped island chain.
- 17. The name of the super continent imagined by Wegener based on his theory.
- 18. The theory that continents changed position on Earth's surface.
- 19. A destructive plate margin that occurs when an oceanic plate is forced down into the mantle beneath a second plate.
- 20. Boundary that occurs when two plates move towards each other.
Down
- 1. Elevated areas of the seafloor that occur ALONG well-developed divergent plate boundaries.
- 3. Deep faulted structure found along a divergent boundary
- 4. No earthquake has ever been recorded below ______ km.
- 6. Boundary that occurs when two plates grind past each other.
- 7. The theory that Earth is divided into several different plates that move through mantle convection.
- 8. Thought to be the primary downward arm of convective flow in the mantle.
- 9. Boundary that occurs when two plates move away from each other.
- 10. Rigid layer of the uppermost mantle and crust.
- 11. Process that explains how plate tectonics produces new oceanic lithosphere.
- 15. A volcanic area of rising mantle material. It's located below the island of Hawaii.