in caves. in the ocean. in the atmosphere of Earth. beneath the surface of Earth.
I gave my students this multiple choice question: Diamonds are formed when carbon is placed under extreme heat and pressure. This process occurs

Only one answer is correct among these 4 choices:
- in caves.
- in the ocean.
- in the atmosphere of Earth.
- beneath the surface of Earth.

Could you tell me which one is correct?

beneath the surface of Earth.