Hi , By the rocks . . . . volcanoes erupt a distinct type of rock known as an igneous rock, which was once molten lava.
(a distinct type of rock; known; as an igneous rock, which was once molten lava) (an igneous rock; was molten; T:once)
a distinct type of rock an igneous rock
known was molten
as an igneous rock, which was once molten lava
T:once