Plate Tectonics

4. The crust that forms the ocean floor
8. When plates are pulled apart at mid-ocean ridges
9. The layer beneath the Earth's crust
10. When older crust is pushed below new ocean crust and squeezes the plates sideways
12. When one plate sinks below another during a collision
14. The place below the ground where the earthquake begins
15. An instrument that detects the seismic waves caused by an earthquake
21. A chain of islands formed at the edges of plate boundaries where one plate subducts
24. A place where extremely hot material from inside the Earth erupts at the surface
26. Where plates are moving apart in opposite directions
27. A section of the Earth's crust that moves about on the Earth's surface
29. Rapid movement of the ground, usually up and down
30. crust Crust that forms the ocean floor

1. Where plates are colliding with each other
2. Where plates are sliding parallel to each other but in opposite directions
3. A huge wave in the ocean caused by an earthquake on the sea floor
5. mountain Mountains formed by crust crumpling upwards as plates collide
6. The point on the Earth's surface directly above the focus of an earthquake
7. When continents separate by moving across the Earth's surface
11. An isolated place away from plate boundaries where lots of magma is collected
13. The centre of the Earth
16. Transverse seismic waves that travels through the Earth
17. A zone where Earth's crust and mantle and being pulled apart
18. Patterns of magnetism trapped in rocks on each side of plate boundaries
19. The Earth's crust AND upper mantle, it's tectonic plates
20. A longitudinal seismic wave that travels fast through the Earth
22. The layer beneath the Earth's crust
23. Molten rock that has erupted onto the Earth's surface
25. Molten rock below the Earth's surface
28. A depression in the ocean floor