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Plate Tectonics Quiz True/False Indicate whether the statement is true or false. ____ 1. The oceanic lithosphere is thicker than the continental lithosphere. Multiple Choice Identify the choice that best completes the statement or answers the question. ____ ____ 2. Which provides the best evidence for the theory that faults and volcanoes are results of tectonic plate interactions? a. Faults on tectonic plates are in constant c. Tectonic plates that have many faults do motion, but volcanoes may not erupt for not usually have volcanoes many years b. Faults and volcanoes existed a long time d. Faults and volcanoes are often found at before there were tectonic plates tectonic plate boundaries 3. Identical rock types, identical fossils, and very similar mountain ranges are found on different continents that are separated by a wide ocean. Which of these best explains these observations? a. Organisms traveled between these c. These continents were joined together at continents on land bridges one time in the past b. The same forces erode mountains in d. Some rock types are very common and are different locations found everywhere ____ 4. ____ Which of these is evidence that North America and Africa collided as Pangaea formed about 270 million years ago? a. Chesapeake Bay c. Appalachian Mountains b. Florida Peninsula d. Great Dismal Swamp 5. The surface of Earth is composed of large tectonic plates that are constantly shifting as they float on top of molten rock. Which process must occur in the mantle to make the plates move? a. normal faulting c. igneous intrusions b. seafloor spreading d. convection currents 6. Which layers of Earth are mostly made of solid material? ____ ____ 7. ____ 8. ____ 9. ____ 10. ____ 11. ____ 12. ____ 13. a. inner core and outer core c. crust and mantle b. crust and inner core d. mantle and outer core Scientists believe continental drift over Earth’s geological history has had a significant impact on Earth’s cycles of warmer and cooler climates. Which statement describes a characteristic of Earth’s continents that is most likely to cause changes in global climate when continents drift? a. The location of the continent affects its c. Continental drift absorbs large amounts of surface reflectivity. kinetic energy. b. Continental plate depth determines its d. The temperature of a continent is affected specific heat. by its nearest ocean. The Theory of Plate Tectonics is based on a. evidence of sea floor spreading. c. an anlaysis of soil at the plate boundaries. b. topographic mapping of mountain ranges. d. volcanic activity along coastlines South America and Africa are two continents separated by a large ocean. Scientists have found 200-million-year-old Mesosaurus fossils on both continents. What is the explanation for the reason these fossils can be found on both continents? a. The continents were both created through c. The animals crossed a land bridge that volcanic activity. once connected the continents. b. The fossils were brought to South d. The continents were once attached to each America by explorers other and then drifted apart. A difference between the oceanic crust and the continental crust is that the oceanic crust is a. composed chiefly of sedimentary rocks. c. older than the continental crust. b. more dense than the continental crust. d. continually being created. The first person to introduce the idea of the continents moving around the surface of Earth was a. Niels Bohr. c. Charles Darwin b. Albert Einstein d. Alfred Wegener Geologists have been studying the movement of plate tectonics for years. Using evidence such as changes in climate, geologists can map the movement of continents. Which discovery supports the claim that climate changes over time? a. magnetic reversals in seafloor rocks in the c. glaciers in South America Pacific and Atlantic Oceans b. similar rock formations in North America d. coal beds in Antarctica and Greenland The continental crust floats on top of the mantle because the crust is a. less dense than the mantle c. made up of oxygen which is a light element b. made of a liquid material d. separated from the mantle by a layer of water ____ 14. At the center of a mid-ocean ridge is a(n) a. subduction zone. c. rift valley. b. fracture zone. d. deep-ocean trench. ____ 15. Ferromagnetic molecules in the liquid igneous rocks orient themselves to align with Earth’s magnetic field. When the rock cools, the molecules are set in place. Earth’s poles swap positions periodically, so molecules from different periods have different orientations. Which finding would support modern plate tectonic theory? a. Bands of ferromagnetic molecules with c. Bands of ferromagnetic molecules with alternating orientations are asymmetrical on either side of a divergent boundary. b. Bands of ferromagnetic molecules with alternating orientations are asymmetrical on either side of a convergent boundary. alternating orientations are symmetrical on either side of a convergent boundary. d. Bands of ferromagnetic molecules with alternating orientations are symmetrical on either side of a divergent boundary. ____ 16. The contributions to the Theory of Plate Tectonics are listed in the table. Time 1912 1950s 1960s 1968 Contributions Alfred Wegener proposes Theory of Continental Drift Scientists begin using echo-sounding devices to study the ocean floor Harry Hess proposes the Theory of Sea-Floor Spreading Scientists propose the Theory of Plate Tectonics by combining the Theory of Continental Drift and the Theory of Sea-Floor Spreading Which statement best identifies the nature of scientific theories? a. Theories continuously change after each c. Theories depend entirely on the new investigation. development of new technology. b. Theories can be revised if new d. Theories are changed when new information adds to old theories. equipment is used in investigations. ____ 17. Scientists used the pattern of alternating normal and reversed polarity in rocks to create the geomagnetic a. time scale. c. reversal time scale. b. sea-floor time scale. d. normal time scale. ____ 18. What is the crack in the ocean floor through which magma rises? a. a ridge c. a rift b. a rip d. a rent ____ 19. How does sediment that is closer to a mid-ocean ridge compare to sediment that is farther away? a. It is larger. c. It is older. b. It is smaller. d. It is younger. ____ 20. Wegener’s hypothesis of continental drift was finally confirmed by a. fossils from the same reptile found on two continents. b. evidence supporting the idea of sea-floor spreading. c. continental coastlines that fit together. d. the formation of mountain ranges such as the Andes. ____ 21. Tectonic plates can include a. only asthenosphere. b. only oceanic crust. c. only continental crust. d. both oceanic and continental crust. ____ 22. Frequent earthquakes in an area may indicate a. tectonic plate boundaries. b. sea-floor spreading. c. mantle convection. d. reversed polarity. Plate Tectonics Quiz Answer Section TRUE/FALSE 1. ANS: F PTS: 1 MULTIPLE CHOICE 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: ANS: OBJ: ANS: ANS: ANS: OBJ: ANS: OBJ: ANS: OBJ: ANS: OBJ: ANS: OBJ: ANS: OBJ: D C C D B A A D B D D A C 2 D B C 3 C 2 D 2 B 4 D 1 A 2 PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: PTS: 1 1 1 1 1 1 1 1 1 1 1 1 1 DIF: 1 REF: 2 PTS: 1 PTS: 1 PTS: 1 DIF: 1 REF: 1 PTS: 1 DIF: 1 REF: 1 PTS: 1 DIF: 1 REF: 1 PTS: 1 DIF: 1 REF: 1 PTS: 1 DIF: 1 REF: 2 PTS: 1 DIF: 1 REF: 2