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Montclair EAES 271 - Volcano Review Questions

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Name: ___Ryan McCoy___Learning Unit 3: Volcano Review QuestionsThis assignment is designed to assess your understanding of Unit 3 and includes some of the Questions forReview at the end of Chapters 6 and 7 from your text plus a few additional questions. Each question can be answered in one to two sentences. Please limit yourself to a maximum of three sentences. Access the assignment, complete it with ANSWERS IN A DIFFERENT COLOR FONT as a separate file, and send it back for evaluation and grading through the assignment tab by or before the due date. 1. In what tectonic environments to volcanic eruptions typically occur?a. They occur typically occur at convergent and divergent boundaries. 2. What changes in heat and pressure are necessary to melt rock and create magma?a. Changes like, adding heat, decrease in pressure (dry), or an addition of watercan cause melting to create magma.3. How does felsic (rhyolite) magma form in the line of arc volcanoes like the Cascades?a. Basalt magma rising from above the subducted slab rises to melt continentalcrust to form the rhyolite.4. How does lava differ from magma?a. Lava and magma differ because of the location they are found. Magma is stilltrapped underground, while lava is above ground. 5. What are the two most-abundant gases in magmas? a. The most abundant are water vapor and carbon dioxide.6. What factors influence the violence or style of an eruption?a. Magma chemistry and content, temperature, viscosity, volume and how much water and gas is in it, groundwater, and the plumbing of the volcano.7. What properties of mafic magma control its eruptive behavior?a. It is by the low silica and low gas content. 8. What properties of felsic/intermediate magmas control their eruptive behavior?a. It is characterized by high silica and high gas.9. What causes differences in viscosity among the major magma types?a.10. If you visit Mount St. Helens, Washington, you will see thousands of trees lying on the ground, all parallel to one another. Explain how they got that way.11. Which of the hazards of volcanoes kill more people than anything else? Why are they so dangerous?12. Why do landslides sometimes trigger explosive eruptions?13. Which gas is heavier than air, collects in low areas, and can asphyxiate people or animals if it is in high concentrations?14. An extremely large volcano with very gentle slopes is likely to be what kind of volcano and is likely to have originated from what composition magma (felsic, intermediate, mafic)? 15. A large, steep-sided volcano is likely to be what kind of volcano and is likely to have originated from what composition magma (felsic, intermediate, mafic)? 16. Why do stratovolcanoes have steeply sloping sides but shield volcanoes have very gently sloping sides?17. What is the driving force behind the explosive activity of a cinder cone? 18. Yellowstone Park has two huge calderas, each more than 20 km across. How do such calderas form?19. What signs (precursors) suggest that a volcano may be preparing to erupt?20. Harmonic tremors recorded on seismographs near volcanoes are generally interpreted

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