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Date Name Class CHAPTER 17 REINFORCEMENT FOR ENGLISH-LANGUAGE LEARNERS Plate Tectonics, Section 1 As you read Section 1, answer the following questions. Restless Continents (p. 456) 1. Is the Earth beneath your feet moving? Discoveries of Earth's Interior (p. 456) 2. are the caused by 3. Name the five layers of the Earth. 4. Why do scientists measure these changes? Copyrig ht ©by Holt, Rineha rt an dWinston. All rig hts reserved. Wegener's Theory of Continental Drift (p. 457) that 5. Is it and 2 were once is the theory that from one 6 continents can another and have done so in the also explained why 7. Continental of the same species are found on of the Sea-Floor Spreading and sides (p. 458) are 8. Mid-ocean chains in Earth's ocean 9. Is the oldest crust close to or farther away from the mid-ocean ridge? mountain REINFORCEMENT FOR ENGLISH-LANGUAGE LEARNERS 107 Class Date Name Chapter 17, Section 1, continued 10. The process by which oceanic lithosphere at mid-ocean ridges is known as 11. What happens when tectonic plates move away from each other and the sea floor spreads apart? Magnetic Reversals (p. 459) 12. What is the Earth's polarity now? years ago, Earth had a 13. But over 14. What is it called when the Earth's magnetic field changes? , the in which these tiny is set in 16. The magnetic points in the of the direction as Earth's occurs, 17. When a magnetic new bands 18. Which way does the rock's magnetic field point? The Breakup of Pangaea (p. 460) 19. What name did Wegener give to the one huge continent? 20. When do scientists believe Pangea split up? 108 HOLT SCIENCE AND TECHNOLOGY point rock Copyrig ht COby Holt, Rineha rt and Wins ton. All rig hts reserved. 15. Once the molten rock Class Date Name CHAPTER 17 REINFORCEMENT FOR ENGLISH-LANGUAGE LEARNERS Plate Tectonics, Section 2 As you read Section 2, answer the following questions. The Theory of Plate Tectonics (p. 461) 1. Do scientists really know why tectonic plates move? Possible Causes of Tectonic Plate Motion (p. 461) is the 2. that the into that of the is around on by the outward 3. These changes are of from Copyrig ht © by Holt, Rine hart an dWi nston. All rig hts resery Tectonic Plate Boundaries 4. within the Earth. (pp. 462-463) tectonic plates have other 5. Tectonic plates can 6. When with , or past each tectonic plates between them is a , the 7. Define convergent. 8. List the three types of convergent boundaries. 9. What happens when a continental/continental collision occurs? REINFORCEMENT FOR ENGLISH-LANGUAGE LEARNERS 109 Date Name Class Chapter 17, Section 2, continued 10. What happens when a continental/oceanic collision occurs? 11. What happens when an oceanic/oceanic collision occurs? tectonic plates between them is a 12. When , the 13. Define divergent. 14. What is another name for a divergent boundary? 15. The most common divergent boundaries are 18. Fill in the chart below with the type of boundary found at each location. Type of boundary Place Aleutian Islands a. Himalayas b. Andes c. Mid-Indian Ridge d. Tectonic Environments 19. The position of a (p. 464) plate is called its 110 HOLT SCIENCE AND TECHNOLOGY within a past Copyrig ht 0 by Holt, Rinehart an d Win ston. All rig hts reserved. tectonic plates , the boundary between them is a each other boundary. 17. Give an example of a transform boundary. 16. When • Name Date Class CHAPTER 17 REINFORCEMENT FOR ENGLISH-LANGUAGE LEARNERS Plate Tectonics, Section 3 As you read Section 3, answer the following questions. Deforming the Earth's Crust (p. 465) 1. How long does it take for tectonic plates to diverge? Stress and Strain 2. (p. 465) is any or 3. In other words, 4. When enough rock, the rock will become • Folding and Faulting 5. causes is (p. 465) is a type of Copyrig ht 0by Holt, Rinehart an d Wi nston. All r ig hts rese that occurs because of is a type of 6. when rock Building Mountains on a , or when rock • in a rock's caused by that occurs because of (pp. 466-467) 7. In fact, the are really a of , long called the mountains form from the 8. Large numbers of created by 9. Fault-block mountains form when downward as the away from each plates blocks of crust tectonic REINFORCEMENT FOR ENGLISH-LANGUAGE LEARNERS 111 Name Date Class Chapter 17, Section 3, continued 10. Parts of the asthenosphere then 11. The 12. When , forming bodies of then , where it forms a mountains. plates plate is toward the of , generally 13. Define subducted. 14. Instead, the rocks at the plate boundary slowly smash each other, of paper. 15. As you saw at the beginning of this chapter, some of the like in the world in this Uplift and Subsidence 16. (pp. 468-469) is the of regions of Earth's is the of regions of Earth's 17 crust to 18. Fill in the concept map below. Because the C- - - - I ) I lithosphere now takes up the ocean floor subsides 112 HOLT SCIENCE AND TECHNOLOGY Copyrig ht 0 by Holt, Rinehart and Wi nston. All rig hts re crust to