Simplify the expression. 
Definitions:
Metamorphic Rock
A rock changed in the solid state by temperature, pressure, deformation, or chemical reactions that modified a preexisting rock.
Magma
Molten rock, which may or may not contain some crystals, solidified rock, and gas.
Hydrothermal Rock
Rock formed from the alteration of pre-existing rock by mineral-rich hot water.
Sedimentary Rock
Rock resulting from the consolidation of sediment.
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