GEO 100 – Environmental Geology - EXAM ANSWER KEY

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GEO 100 – Environmental Geology - EXAM ANSWER KEY

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GEO 100 Environmental Geology - EXAM 2 ANSWER KEYFriday, March 8, 2013Multiple Choice1. Most magmas originate in thea.upper mantle.b.lower mantle.c.outer core.d.inner core.2. Mafic (iron-rich) lavasa.are low in viscosity and flow easily.b.tend to trap dissolved gases, leading to explosive eruptions.c.are viscous and flow sluggishly.d.are associated with subduction-zone volcanoes.3. Most volcanic activity on land areas occursa.along the equator.b.in association with subduction zones.c.at hot spots.d.in continental interiors.4. A well-known volcano associated with a rift zone isa.Mauna Loa.b.Kilimanjaro.c.Mount Katmai.d.Mont Pele.5. Most volcanic rock is created ata.hot spots.b.subduction zones.c.seafloor-spreading ridges.d.fault zones.6. The Columbia Plateau is an example of aa.shield volcano.b.volcanic dome.c.fissure eruption.d.lahar.7. The Hawaiian peak called Mauna Loa is an example of aa.volcanic dome.b.cinder cone.c.composite volcano.d.shield volcano.8. Which of the following is not a type of pyroclastic material?a.volcanic bombsb.volcanic cindersc.volcanic ashd.flowing lava9. Volcanoes composed of pyroclastics are calleda.shield volcanoes.b.stratovolcanoes.c.cinder cones.d.volcanic domes.10. Volcanoes of the Cascade Range area.stratovolcanoes.b.shield volcanoes.c.volcanic domes.d.cinder cones.11. The residents of the Icelandic island of Heimaey stopped a lava flow bya.b

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