Is an igneous rock likely to be composed only of quartz and olivine? Why or why not? (Refer to Fig. 3.3.)
Answer to relevant QuestionsIf, as a mafic (basaltic) magma crystallizes (Figs. 3.3 and 3.4) underground, the crystals are removed from contact with the magma, and the remaining magma crystallizes separately, which kind of a rock will form first and ...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.Figure 3.2 shows the locations of the world’s active volcanoes, is a volcano likely to suddenly appear in, say, Iowa or Minnesota?What are the rounded structures shown in Fig. 3.10?Note the map of major igneous rock bodies along western North America (Fig. 3.15). Name the type of igneous bodies shown, and name the likely dominant rock type present.
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