Page Break 009 - esponse C 14 Points Missed 1 Percentage 93 1 Which of the following is commonly expected near a textbook subduction zone(that is near a

Page Break 009 - esponse C 14 Points Missed 1 Percentage 93...

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esponse:, C /// , 14 Points Missed , 1 Percentage , 93% 1. , Which of the following is commonly expected near a “textbook” subduction zone (that is, near a subduction zone that is so perfect and free of confusing complications that you would use it in a textbook to teach students)? , A., Basaltic mid-ocean-ridge-type volcanoes, such as are found at undersea spreading ridges. B., Slide-past (or transform, with horizontal but not vertical movement) earthquakes and faults, such as occur along the San Andreas Fault. C., Andesitic stratovolcanoes, such as Mt. St. Helens. D., Basaltic hot-spot-type volcanoes, such as at Hawaii Volcanoes. E., Pull-apart earthquakes and faults, such as occur in Death Valley. Pull-apart earthquakes and faults often occur at pull-apart basaltic mid-ocean ridges, which are not subduction zones. Slide-past also occurs on the planet, but not primarily at subduction zones, which also are not hot spots. But subduction does lead to layered thick-lava-flow/blown-up-bits stratovolcanoes of andesitic composition. , Points Earned:, 1/1 Correct Answer:, C Your Response:, C 2. , Melting happens in association with a subduction zone. What is going on to cause this? , A., The motion of the downgoing slab weakens the mantle so that a hot spot from deep below can rise along the downgoing slab and cause melting. B., The scraped-off pile from the subduction zone traps the Earth’s heat beneath, and the downgoing slab passes through this hot zone and melts in response. C., The downgoing slab takes along water, and that water lowers the temperature at which rock melts to allow melting in and near the slab. D., The bending and friction associated with scraping off a pile of sediment, such as the Olympic Peninsula, makes the pile very hot, and the downgoing slab passes through the hot zone and melts in response. E., The immense friction between the downgoing slab and the overlying rocks makes the slab the hottest things in the mantle, causing much melting nearby. , Points Earned:, 1/1 Correct Answer:, C Your Response:, C
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, 3. , The picture shows some rocks on the beach at Olympic National Park. The pocket knife is about 3 inches (or 8 cm) long. What is the story of these rocks? , A., Earthquakes knocked loose undersea muds that raced down the slope into the subduction zone to make these layered rocks, which were scraped off the downgoing slab, part of the process by which continents grow as material is added to their edges at subduction zones. B., The layering comes from different volcanic eruptions that piled material on the beach, as part of the process by which spreading zones tear apart continents, causing them to become smaller over time. C., The pocket knife was flushed out of an airline toilet by an absent-minded geologist, and fell on the rock. D., The pocket knife washed overboard from a Chinese freighter in a storm, and floated to the beach on the currents; scientists use the distribution of such flotsam and jetsam to learn about the oceanic currents that drive plate tectonics.
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  • Fall '08
  • ALLEY,RICHARDBANANDAKRISHNAN,SR
  • Correct Answer, Volcano, subduction zones, Points Earned

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