If a magma crystallizes at a temperature of about 1500°C, what is its likely composition— felsic or mafic? (See Fig. 3.3.)
Answer to relevant QuestionsHow does the rate of cooling of a magma affect grain size of the resultant rock, and why? (See Fig. 3.4.)What kind of igneous rock bodies are the light-colored rocks shown in Fig. 3.7?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.)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 ...Refer to Fig. 3.16. What is the viscosity and composition of the lavas which formed Hawaii?
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