Question 4 For a magma of composition 10 % B, what is its first crystallization reaction? 50 Liquid 40 B+L 30 A+L C+L 20 B+C 10 A+C 0.2 0.4 0.6 0.8 1.0 This is a generic phase diagram for solid phases A, B, and C, and for liquid phase L. X and Y are labels for the points just above them; X and Y are NOT phases. A composition of 0.4 B is 40% B. Assume all processes are equilibrium processes, unless otherwise stated. (5.)1

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