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This homework has 2 main parts: In the first part, students are given bulk compositions for 6 volcanic rocks and asked to classify them, think about their normative compositions, and given likely tectonic settings for three of them. In the second part, they work with a complex binary phase diagram. In this part, they must think about components vs. phases, the lever rule, behavior at a peritectic point, and fractional removal of a phase. After completing this homework, I find that students are comfortable working with any binary diagram I give them.
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