Figure 3.2 shows the locations of the world’s active volcanoes, is a volcano likely to suddenly appear in, say, Iowa or Minnesota?
Answer to relevant QuestionsIgneous 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:What is the volcanic rock which has the same composition as a granite?Note the similarities in the sketches of Mt. St. Helens (Fig. 3.11) and Crater Lake, Oregon (Fig. 3.12). Surmise how Crater Lake may have formed.Note the columnar joints in igneous rocks in Figs. 3.14 and 3.17. What causes them to form, and how are they oriented relative to the shape of the body?Joints, or cracks in rocks, are natural passageways for air and water. What should happen to joints with time? See Fig. 4.2.
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