GEOL_101_Exam II

GEOL_101_Exam II - GEOL 101: Physical Geology Fall 2010...

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GEOL 101: Physical Geology Fall 2010 Examination II, October 7, 2010 Please mark your Scantron with the best answer for each question. Please ensure that the answer to each numbered question responds to the same number on the Scantron. 1. The last big eruption of Mount Saint Helens occurred when? A. June 20, 1980 B. May 12, 1980 C. October 5, 1980 D. May 18, 1980 2. How many people died during the eruption of Mount Saint Helens? A. 53 B. 57 C. 60 D. 75 3. Mount Saint Helens was a vertical eruption as predicted by the US Geological Survey. A. true B. false 4. How many square miles were affected by the eruption of Mount Saint Helens? A. 120 B. 220 C. 320 D. 420 5. When was the last time Mount Saint Helens erupted prior to the 1980 eruption? A. 456 yrs ago B. 345 yrs ago C. 234 yrs ago D. 123 yrs ago 6. Mount St. Helens, which erupted rhyolitic lava, is a good example of A. shield volcano. B. cinder-cone volcano. C. composite volcano. 7. Which of the following minerals crystallizes early in the Bowen's reaction series? A. biotite B. quartz C. olivine D. muscovite 8. ________ has the same mineral composition as andesite. A. Basalt B. Granite C. Gabbro D. Diorite 9. The last minerals to crystallize on Bowen's Reaction Series result in igneous rocks with a __ composition. A. felsic B. intermediate C. mafic D. ultramafic 1
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10. ________ tends to increase the explosive potential of a magma body beneath a volcano. A. High viscosity and dissolved gas
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This note was uploaded on 12/08/2010 for the course GEOL 101 taught by Professor Amadi during the Fall '10 term at Ole Miss.

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GEOL_101_Exam II - GEOL 101: Physical Geology Fall 2010...

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