Section Review 12-1

1. Section Review 12-1 Page #300: 1-10

2. #1 Describe elastic rebound. The sudden return of deformed rock back to its original shape. http://www.sceyencestudios.com/animation.htm http://www.sceyencestudios.com/movies/elasticrebound.swf

3. #2 Explain the difference between the epicenter and the focus of an earthquake. The focus is located within Earth. The epicenter is a point on the surface above the focus.

4. #3 Compare body waves and surface waves. Body waves travel through Earth’s interior, while surface waves travel only along the outer surface. http://www.pbs.org/wnet/savageearth/earthquakes/index.html

5. #4 Explain how seismic waves help scientists learn about Earth’s interior. Seismic waves behave differently as they pass through layers composed of different materials. These differences help create a picture of Earth’s interior.

6. Earth’s Interior

7. #5 Explain how the structure of Earth’s interior affects seismic wave speed and direction. When seismic waves reach boundaries between rock layers their speed changes. They are reflected or change direction as they pass through layers of different composition.

8. Earth’s Interior

9. #6 Explain why earthquakes generally take place at plate boundaries. Earthquakes result from stress within the lithosphere. They commonly occur at plate boundaries because stress on rock is greatest near plate boundaries, which may be faulted, and thus weaker than plate interiors.

10. #7 If a seismologic station measures P waves but no S waves from an earthquake, what can you conclude about the earthquake’s location? The location of the epicenter was on the opposite side of Earth, because the S waves could not pass through the liquid outer core.

12. The End???? POOR FROSTY……..