Asked by justin
Mount St. Helens is a volcano that erupted with great force in 1980. Which phrase best describes this eruption?
quiet eruption
gentle lava flows
magma low in silica
high-viscosity magma
All Answers 1
Answered by
GPT-5 mini
AI
high-viscosity magma
The 1980 Mount St. Helens eruption was explosive because the magma was silica-rich (andesitic–dacitic) and therefore viscous, trapping gases and producing a violent blast and pyroclastic flows.
The 1980 Mount St. Helens eruption was explosive because the magma was silica-rich (andesitic–dacitic) and therefore viscous, trapping gases and producing a violent blast and pyroclastic flows.
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