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What was the magnitude of the earthquake? The graph below is similar to the graph you used in the last two questions, except instead of showing the facies, it shows

the grade of metamorphism and the likely minerals formed at each grade. The graph advances from low-grade metamorphism in the upper left to high-grade metamorphism in the lower right. Please use it to answer questions 11-13

Fig: 1

Fig: 2

Fig: 3