What are the differences in composition of the two major types of magma?
Answer to relevant QuestionsHow does the chemical composition of a magma affect its viscosity (fluidity)?Basaltic volcanism does not tend to be highly explosive because of the low viscosity of the magma. Yet, the basaltic volcano Surtsey which formed off of Iceland on the Mid-Atlantic Ridge in 1963 was extremely explosive in ...Name another factor, other than the rate of cooling, that can affect crystal size. Very coarse-grained intrusions of igneous rocks (pegmatites) are an example of this factor at work.Igneous rocks are classified on the basis of texture (grain size) and composition (mineralogy). A general indicator of igneous rock composition is the color. Name the following igneous rocks by referring to Fig. 3.4:Volcanoes are classified as active, dormant, or extinct. If they have erupted during the last 50 years, they are clearly classified as active. On what bases are dormant or extinct volcanoes classified, and how can geologists ...
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