What are intrusive igneous rocks?

Intrusive igneous rocks are formed when magma cools and solidifies beneath Earth's surface. This process occurs slowly, allowing for the growth of large mineral crystals, which gives intrusive igneous rocks a coarse-grained texture. Common examples of intrusive igneous rocks include granite and diorite. The formation of these rocks is distinctly different from extrusive igneous rocks, which are formed from lava that cools quickly on the Earth's surface. The other options describe processes unrelated to the formation of intrusive igneous rocks, such as the compression of organic materials or the solidification of minerals from water. These processes lead to sedimentary and metamorphic rocks, respectively, and are not characteristic of igneous rock formation.