Answer all the questions regarding the phase given below in details. You are cooling down the composition X, Y, and Z. Please describe what happens this cooling process. Your answer should include the followings. - What happens when the composition reaches phase boundary - Indicate the eutectic and peritectic points if present. How many phases exist there? - What happens if the compositions reach the eutectic and peritectic points. - For the composition X, the points b, c, and d are at the two-phase region. Indicate the relative ratio of such phases. TC 1900 1800 1700 1600 1500 x-x X 0 MgSiO4 Fo xa -x f Fo + Liq Fo + En 20 N 40 Mg SiO3 En Liquid En + Liq Qz+ Liq Qz + En 60 80 100 SiO Qz