When the hot magma hit the cool air, it hardened, forming igneous rock.
(the hot magma; hit; the cool air) (it; hardened; T:When the hot magma hit the cool air) Context(it hardened,List([37, 48))):(it; hardened forming; igneous rock)
it hardened,List([37, 48))
the hot magma it it
hit hardened hardened forming
the cool air
T:When the hot magma hit the cool air
igneous rock