For the rock (X or Y) that is still completely solid, draw an arrow on the graph that would represent a process that would cause the rock to melt without changing the temperature of the rock

Describe below how changing pressure made the rock melt (did you increase pressure or decrease pressure?).
What will be an ideal response?


The appropriately drawn arrow will be vertical, because the question specifies that temperature is not changing. An arrow drawn vertically upward will cross into the crystals and liquid part of the diagram, indicating the onset of melting. Decreasing pressure, as might happen when the rock physically moves closer to the surface, causes melting (decompression melting).

Environmental & Atmospheric Sciences

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