How do geologists determine whether hot ash flows (glowing avalanches) were minor or major events?
Answer to relevant QuestionsFigure 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?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?Do mechanical and chemical weathering operate independently of each other?Explain carbonation.Which mineral, quartz or olivine, should be most abundant in beach sands?
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