Question

intrusive or extrusive?
formed within earth's crust

Answer 1

Rocks that are formed within the Earth's crust are classified as **intrusive** igneous rocks. These rocks form from the slow crystallization of magma beneath the Earth's surface. Common examples of intrusive igneous rocks include granite and diorite. In contrast, **extrusive** igneous rocks form when magma erupts onto the surface and cools quickly, such as basalt and pumice.