An igneous rock formed when molten rock called lava cools on the earth's surface.
(An igneous rock; formed; T:when molten rock called lava cools on the earth's surface) (molten rock; called; lava cools on the earth's surface)
An igneous rock molten rock
formed called
T:when molten rock called lava cools on the earth's surface
lava cools on the earth's surface