Plate Tectonics

2. Wave A longitudinal seismic wave that that travels fast through earth
4. Push Older crust is pushed below new ocean crust and squeezes the plates sideways
5. Trench A deep channel in the ocean floor where crust is sinking down
7. A place where extremely hot material from inside Earth erupts at the surface
11. Spreading Process of new crust forming at the ocean ridge and spreading
12. A zone where Earth's crust and mantle are being pulled apart
13. Layer beneath Earth's crust
17. When one plate sinks below another during a collision
18. The centre of Earth
19. Drift The separating of continents
20. An instrument that detects the seismic waves form an earthquake

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
3. Boundary Where plates are sliding parallel to each other, but in opposite directions
6. The focus or middle point of an earthquake
8. A huge wave caused by an earthquake on the sea floor
9. mountain Mountains formed by crust crumpling upwards as plates collide
10. Name for the crust and the upper mantle together; Earth's tectonic plates
14. Earth's outermost solid layer
15. A layer of plastic in the lower mantle
16. Plate Section of Earth's crust that moves about on earth's surface