solidify at the surface of Earth. be eroded and deposited in layers. be formed from magma. change form when pressure is applied.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: In order for rocks to be classified as igneous, the rocks must
Possibilities:
- solidify at the surface of Earth.
- be eroded and deposited in layers.
- be formed from magma.
- change form when pressure is applied.

be formed from magma.