How do igneous rocks form?
A) Crystallization of magma
B) Deposition of sediment
C) Transportation of sediment
D) Changed in form by heat and pressure without melting
E) Earthquakes create them.

Question

Quizplus · Accepted Answer

Igneous rocks form when magma (molten rock) cools and crystallizes either beneath the Earth's surface (intrusive or plutonic igneous rocks) or on the Earth's surface (extrusive or volcanic igneous rocks). This process of solidification and crystallization is known as crystallization of magma, hence option A is the correct answer.

How Do Igneous Rocks Form