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 its early stages. Why?
Answer to relevant QuestionsIs an igneous rock likely to be composed only of quartz and olivine? Why or why not? (Refer to Fig. 3.3.)How does a porphyritic rock, as in Fig. 3.6(b), form?Figure 3.9(b) depicts a pile of pillows tilted to a vertical position. In which direction are the pillows topping (that is, which is the top of the sequence?)What are the two most abundant igneous rocks?Figure 3.14 is a sketch of lava flows in the Columbia Plateau region of northwestern United States. What do the flows indicate about the viscosity and composition of the lava?
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