Decreasing the pressure will not produce liquid rock below the surface.
The liquid below the surface of the earth is mostly molten rock, called magma. It is found in the mantle layer of the earth, between the crust and the core. The outer core of the earth is also a liquid, consisting mainly of molten iron and nickel.
"Hot liquid rock" exposed at or above the surface is called lava whereas if it is below the surface it is called magma.
water molecules can evaporate at the surface but not below the surface
Liquid iron and nickel is found in the Earth's outer core. The upper boundary of the outer core is around 2,890 km (1,790 miles) below the surface of the Earth.
When air high above the Earth's surface is cooled below the dew point, it is likely to form clouds. Clouds are visible mass of liquid droplets or frozen crystals made of water.
Saturn's moon Titan has liquid methane on and presumably below the surface.
When a liquid changes to a gas below its surface as well as at the surface, the liquid is at a temperature equal to or greater than its boiling point.
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Evaporation occur at the surface of a liquid; under the surface is vaporization.
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Magma.
plasma
Boiling
Magma .
The liquid below the surface of the earth is mostly molten rock, called magma. It is found in the mantle layer of the earth, between the crust and the core. The outer core of the earth is also a liquid, consisting mainly of molten iron and nickel.