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OCN 201 First Quiz Questions

The Origin of Ocean Basins

Pinet - Chapter 3

Spreading Ocean Ridges (p. 59)

1. Where does new sea floor form? (Also see figs. B1-1, 3-5, and 3-8)

2. Define the term sea-floor spreading. (Also see p. 636)

3. Give the proof that Earth's magnetic poles reverse periodically. (Also see fig. 3-5)

4. Describe the changing size of the Atlantic Ocean.(Also see fig. 3-6a)

5. Give the range of seafloor spreading rates for each MOR flank in cm/yr.

6. Explain why the thickness of seafloor sediment increase with increasing distance from the MOR.

3.3 Global Plate Tectonics

7. Explain how sea floor crust can be created at the MOR, yet Earth's diameter is not increasing. (Also see fig. 3-8)

Subduction Zones

8. Where do most earthquakes on Earth occur? (Also see fig. 3-6a)

9. Give the geological feature associated with sea floor subduction. (Also see figs. 3-6b and 3-8)

10. Give the depth in kilometers to the Benioff Zone's deepest extent. (Also see fig. 3-6)

11. Explain why volcanism is associated with subduction. (Also see fig. 3.8)

12. Which of Earth's oceans are growing and which are shrinking?

Plate-Tectonic Model

13. At which type of plate boundary, divergent, convergent, or transform, is tension prevalent? (Also see Table 3-1)

14. At which type of plate boundary, divergent, convergent, or transform, is compression prevalent? (Also see Table 3-1)

15. Explain why neither tension nor compression occurs at transform (strike-slip) plate boundaries.

16. Give the longest and most famous transform plate boundary. (Also see fig. B2-1, p. 70)

17. Use hot spot, mantle plume, and sea-spreading theories to explain the formation of the Hawaiian Islands. (Also see figs. 3-9 and 3-10)

The Opening and Closing of Ocean Basins

18. Give an example (location on Earth) of the embryonic stage of the Wilson Cycle. (Also see fig. 3-11)

19. Give an example (location on Earth) of the juvenile stage of the Wilson Cycle. (Also see fig. 3-11)

20. Give an example (location on Earth) of the mature stage of the Wilson Cycle. (Also see fig. 3-11)

21. Give an example (location on Earth) of the declining stage of the Wilson Cycle. (Also see fig. 3-11)

22. Give an example (location on Earth) of the terminal stage of the Wilson Cycle. (Also see fig. 3-11)

23. Give an example (location on Earth) of the suturing stage of the Wilson Cycle. (Also see fig. 3-11)