(n.) The melted rock ejected by a volcano from its top or fissured sides. It flows out in streams sometimes miles in length. It also issues from fissures in the earth's surface, and forms beds covering many square miles, as in the Northwestern United States.

aa abyssal rock ash ashes basalt bedrock block lava brand brash breccia calx carbon charcoal cinder clinker coal coke conglomerate coom crag dross druid stone festooned pahoehoe fume gneiss granite igneous rock limestone living rock magma mantlerock metamorphic rock monolith pahoehoe pillow lava porphyry pudding stone reek regolith rock ropy lava rubble rubblestone sandstone sarsen schist scoria scree sedimentary rock shelly pahoehoe slag smoke smudge smut soot stone sullage talus tufa tuff