9. The transition between solid water (ice) and liquid water has a boundary with a negative slope on a pressure versus temperature plot. Which of the following is a direct explanation for this 2 phenomenon?
(A) Solid water is lighter than liquid water.
(B) Water has a high heat of fusion.
(C) Liquid water is denser than solid water.
(D) Solid water is crystalline, and liquid is amorphous.

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統計： A(1), B(1), C(6), D(1), E(0) #2673367