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GMU Geology Questionnaire

 

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1. How are granite and rhyolite different? How are they alike?2. What is the origin of vesicles in a basalt?3. How are basalt and andesite different? How are they alike?4. Which of the rock types in question # 3 (basalt and andesite) would be most likely to form a sill? Which would be most likely to form a laccolith? Why?5. What minerals are likely to form phenocrysts in a basalt? Why?6.Granites may be pink, red, or various shades of gray and have various grain sizes. What characteristics are typical of all granites and distinguish granites from other rock types?7.What igneous rock is most abundant in the upper oceanic crust?8.Why are rocks classified on the basis of texture and composition instead of size, shape, and color?9.What igneous rock types form in a mountain belt? Why are these rocks different from those formed at the oceanic ridge?. Below are the study guidelines