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Intrusive igneous rocks (also called plutonic rocks, named after Pluto, the Roman god of the underworld) are formed from magma that cools and hardens within the earth. Surrounded by pre-existing rock (called country rock), the magma cools slowly, and as a result these rocks are course grained.
IGNEOUS ROCKS are formed from the solidification of molten rock. Most of the Earth is composed of igneous rock. There are 2 major types of igneous rocks; intrusive igneous rocks, and extrusive igneous rocks.INTRUSIVE IGNEOUS ROCKS solidify beneath the Earth's surface.Because the magma cools over a relatively long period of time, Intrusive igneous rocks tend to have large mineral crystals that give the rock a rough granular texture.NTRUSIVE IGNEOUS ROCKS solidify beneath the Earth's surface. Because the magma cools over a relatively long period of time, Intrusive igneous rocks tend to have large mineral crystals that give the rock a rough granular texture.