The higher the pressure at greater depth, the higher the temperature required to melt rock. If a lot of heat or pressure, the rock melts and turns into magma. This causes the formation of an igneous rock rather than a metamorphic rock.
Pressure: Pressure rises with depth, but as pressure rises, so does the melting temperature, so melting is less likely at higher pressures. Water: Adding water to rock changes its melting point. The melting point decreases as the amount of water molecules increases. Because most liquids are less dense than solids, increasing the pressure raises the melting point.
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