Which of the following is not a metamorphic agent?

A. Lithification

B. Chemically active fluids

C. Heat

D. Pressure

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.

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