Earthquakes

4. The process of an oceanic plate colliding with and descending underneath a continental plate.
5. Large ocean wave created by undersea earthquakes or volcanic eruptions.
6. Fault that makes California an area of high risk for earthquakes.
7. Other name for the crust.
8. The area of the earth's surface that is directly above the origin of an earthquake.
11. Layer above the outer core.
14. Force that drives plate tectonics.
15. An instrument used to detect and record earthquakes.
16. Older, lighter plate.

1. Used to measure the strength of earthquakes.
2. Waves from an earthquake are known as these.
3. A crack in the earth's surface along which movement takes place.
9. The large, thin, plates that move relative to one another on the outer surface of the Earth.
10. Younger, heavier plate.
12. The point within the earth where an earthquake rupture starts.
13. Thinnest layer of the Earth.