There are many processes which creates a metamorphic rock. Which one is the only one that is required in that process?a. Differential stressb. Confining pressurec. Heat

Head

Explanation:

The original rock ( protolith) is subjected to heat (temperatures greater than 150 to 200 °C) and pressure (100 megapascals (1,000 bar) or more), causing profound physical or chemical change.

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