The sequence of the Metamorphic rock occurs when the shale is subjected to increasing heat and pressure.
Basically, when Igneous rock are formed through Molten Magna, the process called Erosion, Weathering and other natural process turns the into Sedimentary rock.
The Sedimentary rock also called the Shale also transformed into the Metamorphic rock under increasing heat and pressure.
Therefore, in conclusion, the answer is Metamorphic rock.
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