Plate Tectonics

2. supercontinent that began to break apart 200 million years ago
3. theory of the formation and movement of the rigid pieces, or plates, that cover the Earth’s surface
7. where two tectonic plates are moving towards each other
9. the movement of continents resulting from convection currents in the mantle
13. area in which crust plunges back into the Earth’s interior
15. the region below the lithosphere where convection currents occur
16. a scale indicating the magnitude, or energy output, of an earthquake
17. the process of mountain building
19. area of the Earth that does not receive vibrations from earthquakes

1. a layer of the Earth that extends from the bottom of the crust to the outer core
4. energy that is generated by an earthquake that travels within the Earth or along its surface
5. where two adjacent plates are moving away from each other
6. vibrations caused by the sudden movement of Earth’s crust
8. outer solid shell of the Earth that extends to a depth of about 100 km
10. where two adjacent plates slides against each other in a sideways motion
11. a system of cracks in the Earth’s crust through which molten material rises
12. thin, outermost layer of the Earth
14. innermost layer of the Earth
18. a crack in Earth’s crust along which movement has occurred