
In volcanology, a lava dome or volcanic dome is a roughly circular mound-shaped protrusion resulting from the slow extrusion of viscous lava from a volcano. The geochemistry of lava domes can vary from basalt to rhyolite although most preserved domes tend to have high silica content. The characteristic dome shape is attributed to high viscosity th...
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http://en.wikipedia.org/wiki/Lava_dome

A steep-sided mass of viscous (doughy) lava extruded from a volcanic vent, often circular in plane view and spiny , rounded, or flat on top. Its surface is often rough and blocky as a result of fragmentation of the cooler, outer crust during growth of the dome.
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http://midju.tripod.com/glossary.html

Mass of lava, created by many individual flows, that has built a dome-shaped pile of lava.
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http://www.encyclo.co.uk/local/21455

a bulge of lava that never flows
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https://sciencetrek.org/sciencetrek/topics/volcanoes/glossary.cfm

A steep-sided rounded extrusion of highly viscous lava squeezed out from a volcano and forming a dome-shaped or bulbous mass above and around the volcanic vent. The structure generally develops inside a volcanic crater.
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https://www.encyclo.co.uk/local/22327
No exact match found.