The main agents that cause metamorphic rocks to form are
A. weathering and erosion.
B. heat and pressure.
C. melting and cooling.
D. deposition and compaction.​

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Answer:

B. Heat and Pressure

Explanation:

This is because the rocks were once igneous or sedimentary which underwent change through physical and chemical processes...

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Answer:

B. heat and pressure.

Explanation:

They form when rocks are exposed to high heat and high pressure.