The three main types of volcanoes are illustrated in cross-section in Fig. 3.5. Note scales. Name each type.
Answer to relevant QuestionsWhat are the differences in composition of the two major types of magma?What is the source of the basaltic lavas of the midoceanic ridges?How does a porphyritic rock, as in Fig. 3.6(b), form?Figure 3.2 shows the locations of the world’s active volcanoes, is a volcano likely to suddenly appear in, say, Iowa or Minnesota?How would one distinguish between an amygdaloidal basalt and a porphyritic basalt?
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