Which type of rock formed deep below the surface?

A. Chemical Sedimentary Rock

B. Intrusive Igneous Rock

C. Foliated Sedimentary Rock

D. Extrusive IgneousRock

Igneous rocks form when hot molten rock (magma) cools and literally "freezes" into solid rock. Because magma comes from deep inside the Earth, igneous rocks tell geologists about what is happening in the interior of the Earth. So it's between "a" and "d", what do you think the answer is?