2. 200 300 400 500 100 200 300 400 500 100 200 300 400 500 100 200 300 400 500 100 200 300 400 500 100 Structure of Earth Earth has Four parts Seafloor Spreading Plate Tectonics I Plate Tectonics II Final Jeopardy

3. The thin, rigid outer layer of Earth that includes the surface.

4. What is the crust?

5. The thickest layer of Earth, mostly hot rock.

6. What is the mantle?

7. The part of Earth’s center that is composed of liquid iron and nickel.

8. What is the outer core?

9. The crust and the uppermost part of the mantle that is rigid.

10. What is the lithosphere?

11. The hotter, softer layer of the upper mantle upon which the lithosphere floats.

12. What is the asthenosphere?

13. This is the most abundant gas in Earth’s atmosphere.

14. What is Nitrogen?

15. These are Earth’s layers from inside to out.

16. What is inner core, outer core, mantle, and crust?

17. All living things on Earth are called the ____.

18. What is the biosphere?

19. All the fresh water and salt water on Earth is known as this.

20. What is the hydrosphere?

21. The continents, islands, ocean crust and rock

22. What is the geosphere?

23. A long narrow chain of mountains that runs along the Atlantic Ocean floor.

24. What is the Mid-Atlantic Ridge?

25. The deepest regions of the ocean floor.

26. What are trenches?

27. Huge underwater mountain ranges

28. What are mid-ocean ridges?

29. This is formed at ocean ridges.

30. What is ocean crust?

31. Compared with rocks near the trenches, rocks near the ocean ridges are this.

32. What is younger?

33. A slab of lithosphere that moves on Earth’s surface.

34. What is a plate?

35. A place where two plates are moving toward each other.

36. What is a convergent plate boundary?

37. A place where two plates are moving away from each other.

38. What is a divergent plate boundary?

39. A place where two plates are sliding past each other.

40. What is a transform plate boundary?

41. The process of one plate descending beneath the other.

42. What is subduction?

43. These circular flows of hot, molten matter in the upper mantle may cause plate motion.

44. What are convection currents?

45. Hot mantle material rises because of this property compared to its surroundings.

46. What is density?

47. Daily Double Please make a wager. Then click on the home.

48. Tall mountains form at this type of convergent boundary.

49. What is a continent- continent collision?

50. Where crust is neither formed nor destroyed

51. What is a transform boundary?

52. Daily Double Please make a wager. Then click on the home.

53. The name of a valley in East Africa where two plates are spreading.

54. The Great Rift Valley

55. Final Jeopardy Please Make a Wager

56. Many scientists rejected his hypothesis of continental drift because he could not explain how the continents moved.

57. Who is Alfred Wegener?

58. CONGRATULATIONS! Now you are ready to take your test!