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Eduncle posted an MCQ
October 18, 2019 • 11:01 am 0 points
  • IIT JAM
  • Geology (GG)

Silica-rich viscous magmas often produce:

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    Eduncle Best Answer

    Lava domes are formed when viscous magma slowly extrudes from a vent and piles up around it. Silicon promotes rigidity in magmas because it has a +4 charge and forms multiple bonds with other elements. Domes are consequently often produced by magmas of more silica-rich dacitic-to-rhyolitic compositions. Domes are steep-sided structures typically a few tens of meters to a few hundred meters high and can form at the summit of a volcano, on its flanks, or as independent volcanic centers.

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