NAME HOMEWORK ASSIGNMENT #3 MATERIAL OVERS HAPTERS 8, 9, 10, 11 Assignment is due the beginning of the class period on November 23, 2004. Answers for each chapter will be discussed in class, as Exam #3 is also scheduled for November 23, 2004. Homework answers should be marked on a scantron sheet, which will be provided in class. Each multiple-choice question is worth 1 pt., for a total of 30 pts. for this assignment. hapter 8: Sedimentary Rocks 1. Which of the following sets of processes is written in order of increasing temperature? A) sedimentation, metamorphism, diagenesis ) diagenesis, sedimentation, metamorphism ) sedimentation, diagenesis, metamorphism D) metamorphism, diagenesis, sedimentation 2. What type of sediments are accumulations of solid fragments produced by weathering? A) biochemical sediments ) chemical sediments ) clastic sediments 3. Which of the following environments is an example of a shoreline environment? A) alluvial ) continental shelf ) deltaic D) organic reef 4. In which of the following environments would gravel be least likely to be deposited? A) alluvial ) beach ) deep sea D) glacial 5. Which of the following sedimentary rock groups are most abundant? A) cherts and evaporites ) limestones and dolostones ) sandstones and conglomerates D) siltstones, mudstones, and shales November 23, 2004 1
The following questions refer to the cross section of a sand dune depicted below: 6. Assuming the sand dune was deposited by wind currents, which way was the wind blowing? A) ) ) D) can't determine from the information given. hapter 9: Metamorphic Rocks 7. Marble is a metamorphic rock that forms from? A) granite ) limestone ) sandstone D) shale 8. Which of the following processes will cause metamorphism? A) an increase in pressure ) an increase in temperature ) interaction with hydrothermal fluids 9. What type of metamorphism is caused by high temperature and high pressure imposed over a large volume of crust? A) burial ) contact ) regional D) shock 10. The parallel alignment of mica in a metamorphic rock is an example of. A) bedding ) foliation ) metasomatism D) porphyroblasts November 23, 2004 2
11. What type of metamorphic rock was once used to make pool tables because of its ability to split easily into thin sheets along smooth, parallel surfaces? A) hornfels ) quartzite ) schist D) slate 12. Which of the following is not used to classify foliated rocks? A) the metamorphic grade ) the nature of the foliation ) the size of the crystals D) the texture of the parent rock 13. A non-foliated contact metamorphic rock is called a. A) gneiss ) hornfels ) phyllite D) schist hapter 10: The Rock Record and Geologic Time 14. Which of the following is the best statement of the principle of original horizontality? A) Igneous intrusions form horizontal layers. ) Metamorphic isograds are horizontal before deformation. ) Sediments are deposited as horizontal layers. D) Most igneous, metamorphic, and sedimentary rocks in the Earth's crust form horizontal layers. 15. The principle of superposition states that. A) a fault is younger than the rocks it cuts ) sediments are deposited as essentially horizontal layers ) the present is the key to the past D) undisturbed sedimentary layers get progressively younger from bottom to top 16. Which of the following is used by geologists to determine the relative ages in a rock sequence? A) cross-cutting relations ) fossils ) stratigraphy November 23, 2004 3
17. What is an unconformity? A) a gap in the geologic record ) a period of deposition ) a sedimentary layer of variable thickness D) a sequence of deformed rocks hapter 11: Fold, Faults, and Other Deformations The following questions refer to the geologic cross section below. Units A,,, D, and E are sedimentary rocks. The thick dark line is a fault. 18. When did faulting occur? A) between the deposition of A and ) between the deposition of and ) between the deposition of and D D) between the deposition of D and E 19. Which of the following units is the oldest? A) unit A ) unit ) unit E D) the granite November 23, 2004 4
20. When did the oldest rocks, now exposed at the base of the Grand anyon, form? A) during the enozoic ) during the Mesozoic ) during the Paleozoic D) during the Precambrian 21. The line formed by the intersection of an inclined sedimentary layer and a horizontal plane is called the. A) bed ) dip ) fold axis D) strike 22. Which of the following types of tectonic forces tends to squeeze and shorten a rock body? A) compressive forces ) shearing forces ) tensional forces 23. Which of the following types of tectonic forces tends to push two sides of a body in opposite directions so that they slide horizontally past one another? A) compressive forces ) shearing forces ) tensional forces D) torsional forces 24. Reverse faults form in response to forces. A) compressive ) shearing ) tensional D) torsional 25. What is a thrust fault? A) a low-angle normal fault ) a low-angle oblique fault ) a low-angle reverse fault D) a low-angle strike-slip fault November 23, 2004 5
26. Upfolds, or arches, of layered rock are called. A) anticlines ) faults ) synclines D) unconformities The following questions refer to the geologic map below. Units A,, and are sedimentary rocks; unit A is the oldest and unit is the youngest. The sedimentary rocks are cut by a fault, indicated by the bold line. The fault dips 60 to the northwest as shown by the strike and dip symbol. A 60 A 27. What type of structure is shown in the geologic map? A) a faulted anticline ) a faulted syncline ) a folded strike-slip fault D) The structure cannot be determined from the information given. 28. Which way do the sedimentary layers dip? A) toward the east ) toward the west ) toward the center D) toward the east and west November 23, 2004 6
29. Why is unit A wider north of the fault than it is south of the fault? A) Deeper levels of the structure are exposed on the north side of the fault. ) Erosion has removed most of unit A south of the fault. ) Faulting has thinned unit A south of the fault. D) Unit A had a variable thickness prior to faulting. 30. What type of fault is depicted on the geologic map? A) a normal fault ) a reverse fault ) a right-lateral fault D) a left-lateral fault November 23, 2004 7