Mt. Saint Helens will eventually grow back its lava dome. It is constantley errupting rebuilding its base. The composite volcanoes are also called strato volcanoes and are formed by layers of rock. The shield volcanoe is often shallow slopes at sides and is made from fluid lava. Cinder cones are steep conical hills that build down from a volcanic vent. Block lava moves slowly and are stronger and thicker. Pahoehoe lava is thin sheets of lava and are smooth fast flowing and thick. Aa lava flow is rough and animated with burst of energy.