Plate Tectonics

2. This is the name of the landmass that used to exist, meaning "all earth" in Greek.
3. The "trough" of a landform.
6. Stress that pushes a mass of rock in two opposite directions.
7. A huge hole left by the collapse of a volcanic mountain.
8. These were found in both Africa and South America, and supported Wegener's theory of continental drift.
10. The point on earth's surface that is directly above the focus.
12. This type of plate boundary is caused by ocean floor spreading and creates mid-ocean ridges and volcanic mountains.
13. The balance between the crust and the mantle.
15. A molten mixture of rock-forming substances, gases, and water from the mantle.
19. The "hill" of a landform.
20. These volcanoes are currently erupting.
22. The innermost layer of the earth, made mostly of iron and nickel.
23. This type of volcano is unlike to erupt again.
24. This measures and records the magnitude and location of an earthquake using ground movement.
25. Located in the Pacific Ocean where numerous earthquakes and volcanoes are located.
26. This type of plate boundary is caused by subduction, earthquakes, or volcanoes, and creates trenches and mountains.

1. This is the name of the scientist that originally proposed the idea of continental drift.
4. A break in the earth's crust where slabs of rock slip past each other.
5. The origination of an earthquake inside the earth.
6. This type of boundary causes neither new land to be formed or existing land to be subducted.
9. This measures the strength of an earthquake in terms of 1.0 to 10.0.
11. Lava collects here, the bowl-shaped area that forms around the volcano's vent.
14. A mountain that forms where a normal fault uplifts a block of rock.
16. The second outermost layer of the earth.
17. This is what we call pieces of earth's lithosphere broken into separate sections.
18. Volcanic material that has reached the surface.
21. These types of waves shake violently back and forth.