Which of the following is not a metamorphic agent?

A. Lithification

B. Chemically active fluids

C. Heat

D. Pressure

The answer is easy. The three metamorphic agents are (Heat, pressure, and chemically active fluids). So the answer would be lithification.

Answer: Lithification (Option A)

Explanation:

Metamorphic rocks are formed in a different manner, from both igneous and sedimentary rocks. Metamorphic rocks agents form when pre-existing rocks undergo metamorphism which is essentially from high temperature and pressures. The metamorphic agents include the following:

- Heat

- Pressure

- Chemically active fluids so the remaining option is Lithification

Whereas, Lithification is the procedure in which sediments are compressed under pressure and expel connate fluid and then become a rock.