Plutonic

The term "plutonic" relates to rocks formed underground from the slow cooling of magma beneath the Earth's surface. These rocks, such as granite, develop large mineral crystals that are visible to the eye due to their gradual cooling process. In a broader sense, "plutonic" can also refer to anything associated with the planet Pluto or its moons, but in geology, it specifically describes deep-formed igneous rocks. Overall, it describes rocks created deep within the Earth's crust, resulting in their distinct texture and composition.