Plate Tectonics

2. A layer of plastic in the lower mantle
4. A place where extremely hot material from inside Earth erupts at the surface
6. Name for the crust and the upper mantle together; Earth's tectonic plates
9. Where plates are sliding parallel to each other, but in opposite directions
12. A longitudinal seismic wave that that travels fast through earth
14. A zone where Earth's crust and mantle are being pulled apart
16. Mountains formed by crust crumpling upwards as plates collide
17. The focus or middle point of an earthquake
18. When one plate sinks below another during a collision
19. The rapid movement of the ground,usually back and forth and up and down in a wave motion, due to the movement of tectonic plates

1. Process of new crust forming at the ocean ridge and spreading
3. The separating of continents
5. An instrument that detects the seismic waves form an earthquake
7. Section of Earth's crust that moves about on earth's surface
8. The centre of Earth
10. A deep channel in the ocean floor where crust is sinking down
11. Layer beneath Earth's crust
13. Earth's outermost solid layer
14. Older crust is pushed below new ocean crust and squeezes the plates sideways
15. A huge wave caused by an earthquake on the sea floor