The rock did not turn into an igneous rock due to insufficient temperatures for melting, undergoing metamorphism instead.
Why did the rock not become an igneous rock?
The rock did not become an igneous rock because it did not experience high enough temperatures to melt. Igneous rocks form from molten rock cooling and solidifying, which this rock did not undergo. Instead, it went through metamorphism due to heat and pressure, transforming it into a metamorphic rock.
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