SOLVED

11) A typical rate of seafloor spreading in the Atlantic Ocean is ________. A) 2 feet per year B) 0.1 inches per year C) 20 feet per year D) 2 centimeters per year 12) Which of the following energy sources is thought to drive the lateral motions of Earth’s lithospheric plates? A) gravitational attractive forces of the Sun and Moon B) electrical and magnetic fields localized in the inner core C) export of heat from deep in the mantle to the top of the asthenosphere D) swirling movements of the molten iron particles in the outer core 13) The continental drift hypothesis was rejected primarily because Alfred Wegener could not ________. A) find geologic similarities on different continents B) disprove competing theories that were more accepted by scientists C) identify a mechanism capable of moving continents D) all of the above 14) All of the following are evidence supporting the theory of plate tectonics except for ________. A) changes in the Moon’s orbit due to shifting plates B) ocean floor drilling C) hot spots D) paleomagnetism 15) ________ was never proposed as evidence supporting the existence of Pangaea. A) Geometrical fit between South America and Africa B) Islands of Precambrian rocks along the Mid-Atlantic Ridge C) Late Paleozoic glacial features D) Similar fossils on different continents 16) Which one of the following most accurately describes the volcanoes of the Hawaiian Islands? A) stratovolcanoes associated with subduction and a convergent plate boundary B) shield volcanoes fed by a long-lived hot spot below the Pacific lithospheric plate C) shield volcanoes associated with a mid-Pacific ridge and spreading center D) stratovolcanoes associated with a mid-Pacific transform fault 17) Which of the following statements apply to the asthenosphere, but not the lithosphere? A) zone in the upper mantle that deforms by plastic flowage B) cool, rigid layer of crust and upper mantle that forms the tectonic plates C) deforms mainly by brittle fracturing and faulting D) partial melting of rising granitic plumes produces huge volumes of basaltic magma 18) New oceanic crust and lithosphere are formed at ________. A) divergent boundaries by submarine eruptions and intrusions of rhyolitic magma B) convergent boundaries by submarine eruptions and intrusions of rhyolitic magma C) divergent boundaries by submarine eruptions and intrusions of basaltic magma D) convergent boundaries by submarine eruptions and intrusions of basaltic magma 19) Cooler, older, oceanic lithosphere sinks into the mantle at ________. A) subduction zones along convergent plate boundaries B) transform fault zones along divergent plate boundaries C) rift zones along mid-ocean ridges D) sites of long-lived, hot spot volcanism in the ocean basins 20) Deep ocean trenches are surficial evidence for ________. A) rifting beneath a continental plate and the beginning of continental drift B) sinking of oceanic lithosphere into the mantle at a subduction zone C) rising of hot asthenosphere from deep in the mantle D) transform faulting between an oceanic plate and a continental plate