tectonics

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Tectonics.pdf

Plate Tectonics – Practice Questions

1. Please fill in the missing labels.

2. Please fill in the missing labels.

3. How many large plates form the outer shell of the earth?

4. What lies directly beneath the crust?

5. The upper mantle and crust make up what major tectonic feature of our planet?

6. What lies directly beneath the lithosphere and is around 200 km thick?

7. Continental crust is _________ than oceanic crust.

8. Oceanic crust is on average how thick?

9. A common rock type found within continental crust is called __________.

10. A common rock type found within oceanic crust is called ___________.

11. According to plate-tectonic theory where is new oceanic crust being formed?

12. Where are melts most likely to be produced by the adiabatic rise of mantle?

13. The San Andreas fault is a classical ___________ boundary.

14. The East Pacific Rise and the Mid-Atlantic Ridge represent ____________ boundaries.

15. What is subduction.

16. What is the likely cause of melting of mantle material along convergent margins?

17. The inner core is composed of _______ and ________.

18. What state is the inner core likely in?

19. The outer core is ____ dense than the mantle.

20. Most of the volume of our planet is composed of __________.

21. The Mohorovicic discontinuity separates the __________ from the ___________.

22. What produces the Earth’s magnetic field?

23. The asthenosphere is composed of __________ _________ mantle.

24. New lithosphere is produced at ___________________ _________.

25. Lithosphere is destroyed at _____________________ _________.

26. The mesosphere underlies the _____________________.

27. Please list the seven major lithospheric plates of our planet.

28. The trailing edge of the South American plate lies where?

29. Silicate liquids that exist beneath the surface of the Earth are called ________.

30. Silicate liquids that have flowed out onto the Earth's surface or seabed are called ________.

31. Strato or composite volcanoes are typical of _________________ _______.

32. Mt Shasta and Lassen formed in what kind of tectonic setting?

33. Beneath arcs at what depth does melting likely occur as a result of dehydration reactions?

34. What are the four driving forces behind plate motion?

35. Forearc basins occur between ___________________ __________ and _______________

_____.

36. What kinds of plate boundaries are found in California?

37. Which of the seven major lithospheric plates consists mostly of oceanic lithosphere?

38. The San Andreas fault separates the ____________ plate from the ________

_________________ plate.

39. Where is the Juan de Fuca plate?

40. Where is the Pacific plate?

41. On the following map please identify the 7 major lithospheric plates pointed to by the labels

A, B, C, D, E, F, and G.

42. On the following illustration please identify the major components of a convergent margin

pointed to by the labels A, B, C, D, E, F, and G.

43. On the following illustration please identify the major tectonic components of the western

North American margin labeled (A), (B), (C), and (D).

44. On the following illustration please identify the features pointed to by labels A and B.

45. On the following illustration please identify the feature labeled A.

46. Which of the following, A or B, is representative of a fast-spreading center?

47. As plates move around on the globe they often times collide with each other. Examples

include arc-arc and arc-continent collisions. At least twice in the distant pass, all of the

continents on planet Earth assembled into a supercontinent. The earliest supercontinent

formed about 1.1 b.y. to 750 m.y. ago, and the latest formed about 248 m.y. ago. What

were the names of the former and latter supercontinents?

48. Please identify the features pointed to by the labels A, B, C, and D. What continent lies in

the middle of the image? What oceans lie to the west and east of this continent?

49. The expanding Earth hypothesis was first formulated in the 1950s by S. Warren Carey, an

Australian geologist. Though Professor Carey recognized sea floor spreading and the idea

that the continents had once been assembled into the supercontinent of Pangaea, he did not

recognize an important element of the modern day plate tectonic paradigm. What was that

element and how does it weaken the expanding Earth hypothesis?