Label Volcano Diagram Printout - Enchanted Learning conduit: a conduit is a passage through which magma (molten rock) flows in a volcano. crust: the crust is Earth's outermost, rocky layer. lava: lava is molten rock; it usually comes out of erupting volcanoes. magma chamber: a magma chamber contains magma (molten rock) deep within the Earth's crust. side vent: a side vent is a vent in the ...