Lots of different things come out of a volcano when it erupts depending on what kind of eruption it is. If it is a shield volcano like we have here in Hawai'i, then there is usually a fountain of molten lava that reaches anywhere from 10 to 500 meters into the air. This fountain builds a spatter cone or cinder cone around the vent. Meanwhile, if enough lava is falling from the fountain, a lava flow can develop. If the amount of lava feeding the flow is high