lava dome

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lava dome (plural lava domes)

  1. (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.