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SECTION EARTHQUAKES OCCUR ALONG FAULTS. 2.1 Reinforcing Key Concepts BIG IDEA Earthquakes KEY CONCEPT release stress that has built up in rocks. Earthquakes occur along faults. faults are located along tectonic plate boundaries. The map below shows the locations of moderate or stronger earthquakes around the world. Each black dot represents where an earthquake has occurred. According to the map, what are three areas in which there have been no earthquakes strong enough to be shown on the map? Why do you think these areas have not been affected by significant earthquakes? CHAPTER 2 Earthquakes 1. Rocks move along faults. Most 2. Faults are classified by how rocks move. A fault forms a plane that extends horizontally and vertically. During an earthquake, blocks of rock move along these planes. A fault can be a normal fault, a reverse fault, or a strike-slip fault. Label each of the three pictures below showing these three kinds of faults and describe the type of movement— mainly vertical or horizontal—of each fault. fault plane direction rocks move direction rocks move Copyright © by McDougal Littell, a division of Houghton Mifflin Company Earthquake Plate boundary Uncertain plate boundary direction rocks move A. B. C. 92 THE CHANGING EARTH, CHAPTER 2, REINFORCING KEY CONCEPTS 092-092-sean-urb-b0201-rkc 92 3/10/04, 4:19:07 PM