lava dome (plural lava domes)
- (geology) A roughly circular mound-shaped bulge that builds up from the slow eruption of viscous felsic lava from a volcano.
- Lava domes are rarely seen in shield volcanos, but are common in stratovolcanos because the latter have more silicic magmas.
- Mount St. Helens has been building a new lava dome since the May, 1980 eruption.
Circular mound shaped bulge built up from lava