What is an example of intrusive igneous rock?

Granite is an example of intrusive igneous rock because it forms from the slow crystallization of magma beneath the Earth’s surface. The slow cooling process allows large crystals to develop, giving granite its coarse-grained texture. Intrusive igneous rocks, also known as plutonic rocks, solidify below the surface where the temperature and pressure conditions allow for this gradual crystallization.

In contrast, basalt is an extrusive igneous rock formed from lava that cools quickly on the Earth's surface, resulting in a fine-grained texture. Obsidian is a volcanic glass that also cools very quickly, typically at the surface, leading to its glassy appearance without crystal formation. Andesite, while it can form in subduction zones and has characteristics of both intrusive and extrusive rocks, is generally classified as an extrusive rock due to its formation from lava that cools at or near the surface.