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Chapter 9 answers - 1 In 1980 was the first Cascade Range...

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1. In 1980, _____________ was the first Cascade Range volcano to erupt since Mt. Lassen in 1915-16. a. Mt. Rainier b. Mt. Shasta c. Kilauea d. Mt. St. Helens 2. Which type of basaltic lava flow has a fairly smooth, unfragmented, ropy surface? 3. ____________ is a major dissolved volatile constituent in both magmas and volcanic gases? 4. Volcanic bombs originate ____________. 5. ____________ magma is the most abundant type of erupted at oceanic spreading centers. a. Basaltic b. Granitic c. Andesitic d. Pegmatitic 6. The 1991 Pinatubo eruption in the Philippines caused brilliantly colored sunrises and sunsets to be seen for the next few years. What caused this phenomenon? 7. The ___________ ocean basin is rimmed by the most subduction zones. 8. Which of the following factors help determine whether a volcanic eruption will be violent or relatively quiescent?
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9. Which of the following is associated with deep mantle hot spots? a. Vesuvius and the other volcanoes of Italy b. the volcanoes of Hawaii and Yellowstone National Park c. the very young cinder cones scattered across the southwestern United States d. Mt. St. Helens and other volcanoes of the Cascade Mountains
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