The Changing Earth

1. / Molten rock below the Earth's surface
3. / When oceanic crust collides with continental crust, and the oceanic plate then sinks below the continental plate
4. Arc / A chain of islands formed at the edges of colliding tectonic plates where one plate subducts
5. Drift / The separating of continents by drifting across the oceans
8. / An instruments that detects the seismic waves from an earthquakes
11. Flow / A cloud of ash, rock and gas about 500°C that exists from a volcano like an avalanche
16. / 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
18. Wave / The shaking, wave-like movement of the ground in an earthquake
19. Stripping / Patterns of magnetism trapped in rocks on each side of plate boundaries
20. / The point on the Earth's surface directly above the focus of an earthquake
21. A huge wave in the ocean caused by an earthquake occurring on the seafloor
22. Ground Station / A receiver and computer that can detect satellite signals and calculate its position on the Earth's surface
23. / The place below ground where an earthquake starts
24. Spots / Isolated places away from plate boundaries where a lot of hot magma is being created
25. Trench / A deep trench in the ocean floor that is much deeper than the rest of the ocean floor
26. Wave / A longitudinal seismic wave that travels fast through the Earth

2. / A place where and extremely hot material from inside the Earth erupts at the surface
3. / Where the crust is sinking down into the Earth
6. Crust / The crust that forms the ocean floor
7. / A layer of 'plastic' semi-solid rock in the lower mantle
9. / The process of continents breaking up, subsiding and allowing in the sea
10. Wave / A seismic wave that travels along the surface of the Earth in the crust
11. Tectonics / The theory that the Earth's crust is cracked into many large pieces that move on the asthenosphere
12. Crust / The crust that forms the continents
13. Boundary / Where plates are colliding with each other
14. Boundary / Where plates are moving apart from each other in opposite directions
15. Wave / A transverse seismic wave that travels through the Earth
17. Boundary / Where plates are sliding parallel to each other but in opposite directions
18. Spreading / The process of new crust forming at the ocean ridges and spreading outwards