PLATE TECTONICS

3. The lithosphere is divided into large plates that interact with one another and cause geological activity.
7. When new material at mid-ocean ridges pushes older material aside, tectonic plates shift.
8. The belief that the Earth's continents have been in the same place since the Earth's formation.
10. Mountain ridges run along the seafloor.
11. A large break in a rock.
12. Deep valleys on the seafloor.
15. WAVES The vibration caused by the release of energy during an earthquake.
16. A layer of earth between the crust and outer core, which is divided into upper and lower sections.
17. A ground-shaking release of energy caused by a break in the crust.
19. A devastating catastrophe caused by geological processes
23. Is the separation of two tectonic plates.
24. Occurs when two rocks are pressed together and one block rides up to overlay the other.

1. Is a current in the mantle that occurs when cooler, denser material sinks and warmer, less dense material rises.
2. In earth science, the location within earth where an earthquake starts.
4. Two tectonic plates slide horizontally past each other.
5. The process of denser crust of a tectonic plate sliding beneath less dense crust of another plate; occurs at convergent plate boundaries and produces deep sea trenches.
6. An opening in earths surface where magma and other materials are released.
9. An instrument that measures and records ground vibration.
13. In mid ocean ridges a valley that runs along the centre of the ridge.
14. Is the point at which two tectonic plates collide.
18. The process by which magma rises to the surface at mid-ocean ridges and forms new ocean crust.
20. is the gravitational and subduction-induced pulling of a tectonic plate.
21. The point on earths surfaces above where an earthquake starts.
22. For earthquakes, a number that represents strength.