Unit 3

5. the theory that Earth’s crust is divided into plates that are always moving
8. is the molten rock that erupts from the volcano along with ash and hot gases
9. thick layer of Earth beneath the crust
13. the liquid rock below Earth’s crust
15. natural land shape or feature
16. the layer of Earth extending from Earth’s center to the bottom of the mantle (Metallic)
17. measures the magnitude of an earthquake on a scale of 1-10
19. scientist that studies volcanoes
20. the dropping of weathered rock by wind or moving water
22. a break in the Earth’s crust where rock on one side moves in relation to rock on the other side

1. the thin outer layer of Earth
2. scientist that studies earthquakes
3. the strength of an earthquake
4. very small pieces of rock
6. the process of rock breaking apart
7. the boundary between tectonic plates that are sliding past each other horizontally
10. the point on Earth’s surface directly above the focus of an earthquake
11. the boundary between two tectonic plates moving AWAY from each other
12. a place where hot gases, smoke, and melted rock come out of the ground onto Earth’s surface
14. the process of moving weathered rock from one place to another
18. the boundary between two tectonic plates that are COLLIDING with each other
21. a shaking of Earth’s surface that can cause land to rise and fall