Question

Why do metamorphic rocks often form deep under the surface of the Earth?

Answer 1

Metamorphic rocks are rocks which have been changed by heat an pressure. The deeper you go within the earth, the more heat and pressure there is, which is why metamorphic rocks form there.

Answer 2

The presence of high pressure and heat favors the formation of metamorphic rocks under the surface of earth.

Step-by-step explanation:

Metamorphism process leads to the formation of metamorphic rocks. Metamorphic rocks are formed by the transitions of the existing earth's rock.

Metamorphic rocks are formed and remains stable under high temperature and pressure. These physical condition is available under the surface of the earth.

Hence, metamorphic rocks formed under the deep surface of earth.