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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.
Magma chamber?? what is an intrusive igneous rock? (a rock that forms when magma in such intrusions solidifies underground) Take home message Molten rock underground is called magma, whereas molten rock that has come out of a vent at the Earth's surface is lava.agma chamber?? what is an intrusive igneous rock? (a rock that forms when magma in such intrusions solidifies underground) Take home message Molten rock underground is called magma, whereas molten rock that has come out of a vent at the Earth's surface is lava.