Assignment #5-7: Geology
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1 Assignment #5-7: Geology Name: 1. "Geological processes operating at the present time are the same processes that have operated in the past" is a statement of: A. the Principle of Cross-cutting Relationships B. the Principle of Original Horizontality C. the Principle of Uniformitarianism D. the Principle of Faunal Succession 2. If rock A cross-cuts rock B, then rock A is: A. older than rock B B. younger than rock B C. the same age as rock B D. on top of rock B 3. Which of the following is a method of correlation? A. physical continuity B. similarity of rock types C. similar fossil assemblages D. all of these can be used for correlation 4. Eras of the Standard Geologic Time Scale are subdivided into: A. Eons B. Epochs C. Ages D. None of these 5. Which subdivision of geologic time is the longest? A. Precambrian B. Mesozoic Era C. Teritiary Period D. Miocene Epoch 6. Which is a useful radioactive decay scheme? A. U-238/Pb206 B. U-235/Pb-207 C. K-40/Ar-40 D. all of these 7. Radiocarbon dating is a useful technique for all samples below except: A. wood B. bone C. shells D. granite 8. Radon is a gas derived from the natural radioactive decay of: A. Uranium B. Lead C. Potassium D. Plutonium
2 9. Concentrations of radon are highest in areas where the bedrock is: A. sandstone B. basalt C. phyllite D. black shale 10. Which of the following is not a type of unconformity? A. nonconformity B. disconformity C. uniformity D. angular unconformity 11. A geologist could use the Principle of Inclusions to determine the relative age of: A. fossils B. metamorphism C. anticlines D. shale layers 12. A contact between parallel sedimentary rock layers that records missing geologic time is: A. a disconformity B. an angular unconformity C. a uniformity D. a nonconformity 13. The oldest abundant fossils of multicellular life forms are observed in rocks from: A. the Archean Eon B. The Mesozoic Era C. The Cambrian Period D. The Paleocene Epoch 14. Geologists are reasonably convinced that Earth is: A. 4,500,000,000,000 yrs. old B. 4,500,000,000 yrs. old C. 450,000,000 yrs. old D. 45,000,000 yrs.old 15. Undisturbed sedimentary rock layers occur in horizontal layers. This is a statement of: A. The Principle of Superposition B. The Principle of Cross-Cutting Relationships C. The Principle of Original Horizontality D. The Principle of Faunal Succession 16. Which of the following will affect the half-life of a radioactive element? A. extreme pressure deep in the Earth B. extreme heat deep within the Earth C. bombardment of Earth by cosmic rays D. the half-life of a radioactive element is invariant 17. The Principle of Original Horizontality states that sedimentary rocks are generally deposited as horizontal layers.
3 18. Metamorphic processes invalidate radiometric dating methods. 19. Angluar unconformities represent gaps in the geologic record of an area. 20. Fossils have proven to be useful as relative dating tools. 21. The point within the Earth where seismic waves originate is: A. the epicenter. B. the fault scarp. C. the origin. D. the focus. 22. P-waves are: A. transverse surface waves. B. compressional body waves. C. tensional surface waves. D. shearing body waves. 23. The fastest seismic waves are: A. P-waves B. S-waves C. Surface Waves 24. The first seismic waves to arrive at a seismic station are: A. P-waves B. S-waves C. Surface waves 25. Which of the following describes the build up and release of stress during an earthquake? A. the Modified Mercalli Scale B. the elastic rebound theory C. the principle of superposition D. the travel time difference 26. The amount of ground displacement in a earthquake is called the. A. epicenter B. dip C. slip D. focus 27. Which of the following sequences correctly lists the different arrivals from first to last? A. P waves... S waves... Surface waves B. Surface waves... P waves... S waves C. P waves... Surface waves... S waves D. S waves... P waves... Surface waves
4 28. How do rock particles move during the passage of a P wave through the rock? A. back and forth parallel to the direction of wave travel B. back and forth perpendicular to the direction of wave travel C. in a rolling circular motion D. the particles do not move 29. If only density increases with increasing depth within the Earth, the velocity of a P wave should. A. stay the same B. increase C. decrease 30. If a P wave were to go from a solid to a liquid - what would happen to its velocity? A. stay the same B. increase C. decrease to 0.0 D. decrease 31. If an S wave were to go from a solid to a liquid - what would happen to its velocity? A. stay the same B. increase C. decrease to 0.0 D. decrease 32. Which boundary marks a change from 100% solid to 100% liquid? A. mantle... outer core B. lithosphere... asthenosphere C. crust... mantle D. none of these 33. Body waves consist of the: A. P waves only B. S waves only C. P and S waves D. Surface waves 34. With increasing travel time the difference in arrival times between the P and the S waves A. increases B. decreases C. stays constant D. none of the above 35. Where is the focus with respect to the epicenter: A. directly below the epicenter B. directly above the epicenter C. in the P wave shadow zone D. in the S wave shadow zone
5 36. Point A, where slip initiated during the earthquake, is called the. A. dip B. epicenter C. focus D. scarp 37. Point B is called the earthquake. A. dip B. epicenter C. focus D. scarp 38. Point C is called the A. epicenter B. fault scarp C. seismic wave D. dip of the earthquake 39. What type of faulting is illustrated in this diagram? A. normal B. reverse C. thrust D. abnormal 40. What is the instrumental record of an earthquake? A. A Seismograph B. A seismic section C. A seismogram D. A seismic record 41. What moves to the left in a left-lateral fault? A. The first arrival B. The far side of the fault C. The near side of the fault D. The hypocenter 42. What is the small tick on a strike-and-dip symbol? A. Degree of dip B. Direction of dip C. Direction of strike D. Perpendicular strike
6 43. A downdropped block of the crust, bounded by normal faults on each side, is a A. horst B. normal block C. graben D. syncline E. anticline 44. In a syncline, the oldest rocks will be found: A. on the limbs of the fold. B. near the axis of the fold. C. at the bottom of the fold D. none of these. 45. In an plunging anticline, the fold axis plunges: A. very steeply. B. toward the flanks of the fold. C. toward the youngest rocks. D. none of these. 46. A structural basin is a special case of: A. a dome. B. a syncline. C. an anticline D. a freak of nature. 47. A fault is observed where the hanging wall is displaced upward relative to the footwall. A. This is a normal fault. B. This is a reverse fault. C. This is a left-lateral strike-slip fault. D. This is a right-lateral strike-slip fault. 48. In a syncline, the youngest rocks are on the limbs of the structure. 49. In a syncline, all rock layers dip toward the fold axis. 50. In a plunging syncline, the structure opens in the direction of plunge.
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