Plate Tectonics

1. 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
4. An instrument that detects the seismic waves form an earthquake
5. Section of Earth's crust that moves about on earth's surface
9. Earth's outermost solid layer
12. A huge wave caused by an earthquake on the sea floor
13. Push Older crust is pushed below new ocean crust and squeezes the plates sideways
14. Name for the crust and the upper mantle together; Earth's tectonic plates
15. A place where extremely hot material from inside Earth erupts at the surface
16. Trench A deep channel in the ocean floor where crust is sinking down
18. Wave A longitudinal seismic wave that that travels fast through earth
20. Layer beneath Earth's crust

2. Boundary Where plates are sliding parallel to each other, but in opposite directions
3. Drift The separating of continents
6. A layer of plastic in the lower mantle
7. The focus or middle point of an earthquake
8. When one plate sinks below another during a collision
10. Mountains formed by crust crumpling upwards as plates collide
11. Spreading Process of new crust forming at the ocean ridge and spreading
17. The centre of Earth
19. A zone where Earth's crust and mantle are being pulled apart