PLATE TECTONICS

1. WAVES, The vibration caused by the release of energy during an earthquake.
4. In earth science, the location within earth where an earthquake starts.
5. Is a current in the mantle that occurs when cooler, denser material sinks and warmer, less dense material rises.
6. An opening in earths surface where magma and other materials are released.
12. Is the separation of two tectonic plates.
14. Mountain ridges run along the seafloor.
15. The belief that the Earth's continents have been in the same place since the Earth's formation.
16. An instrument that measures and records ground vibration.
19. is the gravitational and subduction-induced pulling of a tectonic plate.
20. A large break in a rock.
21. A devastating catastrophe caused by geological processes
22. A ground-shaking release of energy caused by a break in the crust.

2. The point on earths surfaces above where an earthquake starts.
3. Is the point at which two tectonic plates collide.
7. Occurs when two rocks are pressed together and one block rides up to overlay the other.
8. In mid ocean ridges a valley that runs along the centre of the ridge.
9. Two tectonic plates slide horizontally past each other.
10. For earthquakes, a number that represents strength.
11. The lithosphere is divided into large plates that interact with one another and cause geological activity.
13. When new material at mid-ocean ridges pushes older material aside, tectonic plates shift.
16. The process by which magma rises to the surface at mid-ocean ridges and forms new ocean crust.
17. A layer of earth between the crust and outer core, which is divided into upper and lower sections.
18. 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.