A lava dome is a rounded, steep-sided mound that forms when viscous lava extrudes slowly from a volcanic vent. Lava domes are significant in studying volcanic hazards, as they can produce pyroclastic flows, lava flows, and explosive eruptions when they collapse or are disrupted.
Reference: Fink, J. H. (1983). “Structure and Evolution of a Rhyolitic Obsidian Flow: Little Glass Mountain, Medicine Lake Highland, Northern California.” Geological Society of America Bulletin, 94(4), 362-380.