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Gneiss would be one such rock. High-grade metamorphic rock describes the type of rock based on the formational parameters of the question.

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10y ago
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13y ago

If the high temperature causes the rock to melt, the result is the formation of an igneous rock. If the rock does not melt then a metamorphic rock is formed.

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15y ago

A metamorphic rock

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Q: When a rock is altered by extreme heat and pressure what type of rock is the result?
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