3. THIS IS

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5. 100 200 300 400 500 Modified T/F Modified T/F Multiple Choice Multiple Choice Completion

6. Some early mapmakers thought that the coastline of South America matched the coastline of Asia. A 100

7. False; Africa A 100

8. DAILY DOUBLE A 200 DAILY DOUBLE Place A Wager

9. Convection currents in the mantle produce a force that causes motion called slab pull. A 200

10. False; basal drag A 200

11. As new seafloor moves away from an ocean ridge, the seafloor cools and becomes more dense than the material beneath it. A 300

12. True A 300

13. If two continental plates converge, a subduction zone forms. A 400

14. False; mountain A 400

15. The weight of a subducting plate helps to pull the lithosphere into a subduction zone in a process called slab pull. A 500

16. True A 500

17. The circulation of material caused by differences in density is called convection. B 100

18. True B 100

19. Scientists at the time rejected Wegener’s hypothesis of continental drift because he could not explain how or why Earth’s continents move. B 200

20. True B 200

21. According the theory of plate tectonics, plates interact at plate boundaries by deflecting each other, moving away from each other, or moving horizontally past each other. B 300

22. False; coming toward B 300

23. Ridge push moves lithosphere in opposite directions away from the mid-ocean ridge. B 400

24. True B 400

25. Normal polarity is a state in which magnetized objects orient themselves to point south. B 500

26. False; Reversed B 500

27. The youngest rocks on the ocean floor are located ____. a. near continents b. at mid-ocean ridges c. far from mid-ocean ridges d. near Asia C 100

28. The youngest rocks on the ocean floor are located ____. a. near continents b. at mid-ocean ridges c. far from mid-ocean ridges d. near Asia

29. The crust and upper mantle make up Earth's ____. a. lithosphere b. asthenosphere c. core d. continents C 200

30. The crust and upper mantle make up Earth's ____. a. lithosphere

31. Plates of the lithosphere float on the ____. a. crust b. asthenosphere c. core d. atmosphere C 300

32. Plates of the lithosphere float on the ____. a. crust b. asthenosphere c. core d. atmosphere

33. While studying the ocean floor, scientists found ____ bands of magnetism. a. plastic b. alternating c. no d. rectangular C 400

34. While studying the ocean floor, scientists found ____ bands of magnetism. a. plastic b. alternating c. no d. rectangular

35. The hypothesis that continents have slowly moved to their current locations is called ____. a. continental drift b. continental slope c. magnetic reversal d. convection C 500

36. The hypothesis that continents have slowly moved to their current locations is called ____. a. continental drift

37. The result of plate movement can be seen at ____. a. abyssal plains b. ocean margins c. plate centers d. plate boundaries D 100

38. The result of plate movement can be seen at ____. a. abyssal plains b. ocean margins c. plate centers d. plate boundaries

39. A lack of explanation for continental drift prevented many scientists from accepting that a single supercontinent called ____ once existed. a. Glomar b. Glossopteris c. Pangaea d. Wegener D 200

40. A lack of explanation for continental drift prevented many scientists from accepting that a single supercontinent called ____ once existed. a. Glomar b. Glossopteris c. Pangaea d. Wegener

41. DAILY DOUBLE D 300 DAILY DOUBLE Place A Wager

42. Scientists have observed that the continents move apart or come together at speeds of a few centimeters per ____. a. century b. decade c. day d. year D 300

43. Scientists have observed that the continents move apart or come together at speeds of a few centimeters per ____. a. century b. decade c. day d. year

44. Scientists believe that differences in ____ cause hot, plastic-like rock in the asthenosphere to rise toward Earth's surface. a. density b. magnetism c. weight d. composition D 400

45. Scientists believe that differences in ____ cause hot, plastic-like rock in the asthenosphere to rise toward Earth's surface. a. density

46. The driving forces of tectonic plates are related to convection currents in Earth’s ____. a. crust b. mantle c. inner core d. outer core D 500

47. The driving forces of tectonic plates are related to convection currents in Earth’s ____. a. crust b. mantle c. inner core d. outer core

48. ____________________ occurs when one tectonic plate descends beneath another. E 100

49. Subduction

50. Places where plates move apart are ________ plate boundaries. E 200

51. divergent

52. The theory of ___________________ explains how new crust is created at mid-ocean ridges. E 300

53. seafloor spreading E 300

54. The arrows in the mantle and oceanic crust indicate the direction of flow of _________________ beneath the plates. E 400

55. convection currents E 400

56. ____________________ is the process occurring in the area marked by the letter R. E 500

57. Ridge push E 500

58. Earth’s continents were once joined as a single landmass called ____________________. F 100

59. Pangaea F 100

60. Plates come together at _____________ plate boundaries. F 200

61. convergent F 200

62. ___________ plate boundaries are places where plates slide horizontally past each other. F 300

63. Transform F 300

64. F 400 A(n) ____________________ is used to measure and record the magnetic signature of the rocks on the seafloor.

65. F 400 magnetometer

66. F 500 ____________________ is the process taking place in the area marked by the letter S.

67. F 500 Slab pull

68. The Final Jeopardy Category is: Plate Tectonics Please record your wager. Click on screen to begin

69. How does a mid-ocean ridge form? Click on screen to continue

70. As the seafloor spreads apart, magma moves upward and flows from the cracks. It becomes solid as it cools and forms new seafloor. As new seafloor moves away from the ridge, it cools, contracts, and becomes denser than the material below it. This dense, colder seafloor begins to sink, helping to form the mid-ocean ridge.

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