PLSS 0201 Assignment

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Geology

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Apr 3, 2024

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Tuskegee University Founded by Booker T. Washington Introduction to Geology PLSS 201 Assignment 9/21/23 Provide your responses to the questions below, note you may need additional resource than your class notes and textbook to answer the questions. 1. Briefly compare the 1980 eruption of Mount St. Helens to a typical eruption of Hawaii’s Kilauea Volcano. Mount St. Helens has more water in its magma than Hawaii’s Kilauea magma. Mount St. Helens was sudden and more explosive generating a blast of ash and projectiles whereas the Kilauea are generally non-explosive generating relatively quiet gentle outpourings of lava. 2. List the magmas in order, from the highest to lowest silica content: mafic (basaltic) magma, felsic (granitic/rhyolitic) magma, intermediate (andesitic) magma Felsic (granitic/rhyolitic) magma, intermediate (andesitic) magma, Mafic(basaltic) magma 3. List the factors that determine the manner in which magma erupts and explain why/how they impact eruptions. The viscosity and gas content of magma determines how it erupts. Low viscosity and low gas content generally lead to quiescent eruptions. Magma with lots of silica is thick and gooey, while magma low in silica is thin and runny. And magma with lots of gas causes bubbles to form as it rises. 4. Explain viscosity Viscosity is the ability of a liquid to resist flowing. This means liquids with a higher viscosity are thicker and do not flow as easily. The viscosity of magma will determine the shape a volcano takes over continued eruptions. 5. Are volcanoes fed by highly viscous magma more or less likely to be a greater threat to life and property than volcanoes supplied with very fluid magma? Explain your answer. A volcano fed by highly viscous magma is likely to be a greater threat to life and property than a volcano supplied with very fluid magma because with high viscous magma gas is trapped more in the magma so the gas will build up and then eventually explode, whereas with fluid magma the gas can escape allowing the magma just to flow out of the volcano. 1
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