Solidification (but that's too obvious, isn't it?). You could even argue that Cooling would also be a correct description of the process. Lithification seems like it would be good, too, but that actually refers to the process of, say, sand being compressed and heated until it becomes sandstone.
molten lava can turn into molten rock
rock
The igneous rock is formed when a rock that is solidified from molten or partly molten matierial.
Solidify...?
molten rock
Magma or lavaLava is molten rock. Magma is a mixture of molten rock and solids.
Molten rock is known as Magma when underground and has not yet been erupted onto the surface.
The word rock is a solid thin
Magma, or also Lava.
Yes, magma is another name for the molten rocks that are beneath or in the crust.
Molten Rock
sublimation