How does metamorphic rock turn into igneous rock

Metamorphic rocks go underground to melt and become magma. When a volcano erupts, magma flows out of it. (P. S ... When magma is on the earth's surface, it is called lava.) As the lava cools it hardens and becomes igneous rock.

If it finds its way down the earths crust through rock cycle and then it melts and mixes together to form magma, it could re-erupt to earths surface and form an extrusive igneous rock or cool and solidify within the earths crust as an intrusive igneous rock.