The shortest path for an igneous rock to become a metamorphic rock is heat and pressure.
What is an igneous rock?
Igneous rocks are the rocks that are formed when hot magma or molten rocks cool down and are solidified. These rocks are formed near the places where volcano eruption happens.
Metamorphic rocks are the rocks that are formed by the heat and pressure of the earth's crust, so heat and pressure are the shortest way to form the rock.
Thus, the shortest process is heat and pressure.
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