Chapter 7

1. At what type of plate tectonic boundary would you expect tensional forces to occur? divergent convergent transform

2. At what type of plate tectonic boundary would you expect compressional forces to occur? divergent convergent transform

3. At what type of plate tectonic boundary would you expect shearing forces to occur? divergent convergent transform

4. Which is the hanging wall? B

5. What type of fault is illustrated? normal reverse strike-slip Hanging wall Foot wall

6. What is the relative sense of motion on the fault? hanging wall up hanging wall down Hanging wall Foot wall

7. Which fault type can produce vertical repetition of rock layers? left lateral right lateral normal reverse

left lateral right lateral normal reverse 8. What is the relative displacement of the fault that offsets the stream in the photo? left lateral right lateral normal reverse

9. What type of stress caused these folds? compressional tensional shearing

10. Which of the following conditions promotes ductile flow (vs 10. Which of the following conditions promotes ductile flow (vs. brittle behavior)? deep crustal depth soft rock types (e.g., gypsum) higher temperature slower deformation compression (vs. tensional stress) All of the above.

11. In a structural dome, the oldest rock layer is located: in the center of the bull’s-eye. at the edge of the bull’s-eye. cutting across the bull’s-eye.

12. Which structure is the anticline? B C C A B

13. Which structure is the syncline? A B C C A B

14. This region of crust shows evidence of ____. shortening due to compressional stress extension due to tensional stress extension due to shear stress both A and B both A and C

15. Which type of deformation occurred first? folding faulting

16. Purely tensional stresses associated with a _________ plate boundary will generate a _______ fault. A. convergent; strike-slip B. convergent; normal C. divergent; reverse D. divergent; normal

17. What kind of fault is produced by purely compressional stress? A. left-lateral strike-slip fault B. thrust fault C. normal fault D. right-lateral strike-slip fault

18. Shear stress combined with compressional stress will result in: A. purely vertical motion. B. purely horizontal motion. C. oblique motion. D. All of the above. E. None of the above.

19. When considering the effects of faulting on the lithosphere, it is clear that normal faults serve to effectively: A. shorten and thicken the crust. B. thin and shorten the crust. C. thin and extend the crust. D. shorten and thin the crust.

20. Most faults in nature have an oblique component because: A. tectonic stresses are typically purely vertical. B. tectonic stresses are typically purely horizontal. C. horizontal motion is more easily accommodated than vertical motion. D. differential tectonic stresses have both vertical and horizontal components.