fire fountain
/ˈfʌɪə ˌfaʊnt(ɪ)n/noun
1A firework that produces jets of flame or sparks like jets of water issuing from a fountain; the display of such a firework.
2A jet or spray of molten lava propelled upwards from a volcanic fissure or vent.
Origin
Early 18th century. From fire + fountain, originally after French fontaine de feu.