Plutonic rock, also known as intrusive igneous rock, forms deep within the Earth's crust from the slow cooling of molten magma. This gradual cooling allows large crystals to develop, giving these rocks a coarse-grained texture. Common examples of plutonic rocks include granite and gabbro. These rocks are typically exposed at the surface through erosion and tectonic activity. Plutonic rocks are important in geology as they provide insights into the Earth's interior and the processes that shape our planet. Their durability makes them valuable for construction and decorative purposes.