Plate Tectonics

3. an ancient organisms that has been preserved in rock
5. Wegener- the person that came up with the theory of Continental Drift
6. the process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary.
9. valley-A deep valley that forms where two plates move apart.
10. drift- Continents slowly move on Earth's surface
12. core-a dense sphere of solid iron and nickel at the center of Earth
13. tectonics-a section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of continental and oceanic crust.
14. floor spreading- the process by which molten material adds new oceanic crust to the ocean floor.
16. soft layer of the mantle on which the lithosphere floats
19. middle of the ocean contribute to seafloor spreading

1. the layer of the earth between the crust and the core
2. core-the liquid layer of the Earth's core that lies beneath the Mantle and surrounds the inner Core
3. Fractures in rock
4. solid part of the earth consisting of the crust and outer mantle
7. ocean ridge-a deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the oceanic mantle.
8. plates that rub against each other
11. the outer layer of the Earth
15. - plates collide together to make mountains
17. A former supercontinent on the Earth in the distant past a large landmass
18. ocean ridge-an undersea mountain chain where new ocean floor is produced at a divergent plate boundary.