GLY1000 Exam 2 Practice Test AnswersProfessor Leroy Odom(As I have been told, the test will be the same as this practice)1. The magnitude of an earthquake can be determined from seismograph records. The information needed to do thisincludes.A. the time of the quake C. the amplitude of the wavesB. the frequency of the waves D. the type of fault motion2. S-P wave time intervals can be used to determine theA. distance to an epicenter B. magnitude of a quakeC. the frequency of waves D. both A and CI. E. none of the above3. Gravity anomaliesA. is a german heavy metal bandB. occur during magnetic reversalsC. are strictly high values of gravityD. can be related to crustal thickness4. Earthquakes are caused byA. the high strain rates associated with ductile deformationB. the sudden release of elastic strain energy stored in rocks.C. abrupt changes in the geothermal gradientD. the sudden breaking open of large rifts in the Earth's crust.5. Along convergent plate boundaries, earthquake fociA. are located along inclined zones with the deepest quakes nearest the trenchB. are located along inclined zones with the most shallow quakes nearest the trenchC. Are all shallowD. are all deep6. Along oceanic ridges and continental rifts, earthquake fociA. are all deep (>40OKm)B. are all shallow (< 100 KM)C. are located along inclined zones with the most shallow quakes nearest the ridge or rift centerD. are between 100 and 200 km deep7. The October, 1989, Loma Prieta earthquake in the San Franciso/Oakland area was aA. shallow quake B. intermediate depth quake C. deep,quake8. This 1989 quake had a magnitude of 7.0. The amount of energy released during this quake was less than that released in the magnitude 8, quake that struck Alaska in 1964 by a factor ofA. 0.1 B. 8/7 C. 30 D. 1000 E. 29.ln the case of both earthquakes mentioned above, the damage to buildings was greatest in areasA. built on unconsolidated sedimentsB. built on metamorphic rocksC. built on high groundD. built on low groundE. with cable TV10. Which of the following has not been considered evidence for continental drift?A. the apparent continuation of certain large structures such as the Appalachian mountain chain from one continent to another.B. the simultaneous (with regard to geologic time) occurrence in the fossil record on different continents of certain land animalsC. Rocks of the same age on different continents show the same history of magnetic reversals.D. the apparent good fit of the margins of continents on either side of the Atlantic Ocean11. Which of the following mountain belts was not formed by continental collision?A. Andes B. Appalachians C. Himalayans D. Urals12. Devonian age (360 million years old) volcanic rocks in Nova Scotia have magnetic inclinations between 0 and 6 degrees..This might be interpreted to indicate that during the DevonianA. the magnet field was very weakB. Nova Scotia was closer to EuropeC. Nova Scotia was much closer to the north pole than it is now.D. Nova Scotia was much closer to the equator than it is now.13. In old mountain belts, the suture, or line that marks the boundary along which colliding continents became joined can be approximately located by careful study of certain geologic features. Which of the following features are not useful for this? A. cross bedded sandstone B. ophiolites C. fossil assemblages D. melanges14. The active ridges are the highest areas of the ocean basins becauseA. They are the oldestB. They are highly foldedC. They contain the thickest accumulation of sedimentsD. They are the warmestE. The crust there is basaltic and thus less dense15. The age of the crust of ocean basinA. increases with increasing distance from the ridgesB. decreases with increasing distance from the ridgesC. is everywhere older than continental crustD. A and C16. Subduction is a process by which oceanic crust and lithosphere is recycled into the asthenosphere.This subduction always occurs alongA. oceanic ridges B. oceanic trenches C. transforms D. Rifts17. In which of the following materials is the velocity of P waves the greatest? (hint: disregard differences in densities)A. clay B. water C. air D. steel E.rubber18..In which of the materials above do P waves travel with the slowest velocity? (hint: disregard differences indensities) C.Air19. Methods to monitor the buildup strain along earthquake generating faults is one attempt at forecasting. These methods includeA. the use of strain meters D. all of the aboveB. careful surveying across faults E. none of the aboveC. measuring ground level20. Evidence that the Earth's outer core is liquid A. The temperature is too high for solids to existB. The density is too low to be a solidC. It is too compressible to be a solidD P wave velocities are too highE. S waves are not transmitted here21. Which region of the Earth is the most rigid when subjected to rapidly applied stresses (such asduring passage of S waves)?A. atmosphere B. upper mantle C. crust D. lower mantle22. The significant difference between the lithosphere and the asthenosphere is mechanical behavior and this difference is due to a difference inA. composition B. age C. temperature D. water content23. Earthquakes do not originate in the asthenosphere becauseA. the asthenosphere yields to long term stress by flowing and can not accumulate elastic strainB. the asthenosphere is too dense to transmit seismic wavesC. the asthenosphere is basically brittle and thus can not transmit shock wavesD. The Mg and Fe contents are too lowFor items 24 through 32 select one of the following regions of the EarthA. crust B. core C. upper mantle24. It contains the asthenosphere C25. it is entirely within the lithosphere A26. is believed to be the source of the Earth's magnetic field B27. composed largely of peridotite C28. source of diamond-bearing kimberlites C29. believed to be similar in composition to metallic (Fe-Ni) meteorites B30. lies above the mohorovicic discontinuity A31. where rocks can retain a permanent magnetization B32. where partial melting that produces basaltic magmas occurs CFor items 33 - 38, select one of the following geographic areasA. Florida B.Rocky Mountains C. Hawaiian Islands33. depth to the Mohorovicic discontinuity is 45 to 50 km B34. depth to the Mohorovicic discontinuity is 30 km A35. depth to the Mohorovicic discontinuity is 6 to 8km C36. there are no significant gravity anomalies A37. gravity anomalies are strongly positive C38. gravity anomalies are strongly negative BFor
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