How does the chemical composition of a magma affect its viscosity (fluidity)?
Answer to relevant QuestionsWhy are there three main types of volcanoes?Is an igneous rock likely to be composed only of quartz and olivine? Why or why not? (Refer to Fig. 3.3.)Why do many of the late-forming pegmatites of the previous question contain rare elements such as lithium, tin, and beryllium?Why was obsidian a much sought after rock which was traded far and wide by the Native Americans? (For example, obsidian from Yellowstone Park was traded as far east as Ohio.)Mt. Somma (ancestral Mt. Vesuvius), which towered above the Roman seaside resort cities of Pompeii and Herculaneum, hadn’t erupted for 800 years, when in A.D. 79, it erupted. What happened to the two cities?
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