Final answer:
The molten mineral matter within the Earth is called magma. It can either stay inside the Earth as intrusive, or plutonic, igneous rock or find its way to the surface as extrusive, or volcanic, igneous rock.
Step-by-step explanation:
The molten mineral matter within the Earth is called magma. Magma is formed when molten material inside the Earth cools and solidifies. It can either stay inside the Earth as intrusive, or plutonic, igneous rock or find its way to the surface as extrusive, or volcanic, igneous rock. Extrusive igneous rocks are formed when magma flows onto the surface or into cracks near the Earth's surface, cools quickly, and has very fine grains.