Question

Mount St. Helens is a volcano that erupted with great force in 1980. Which phrases best describe this eruption? Check all that apply.
quiet eruptiongentle lava flowsmagma low in silicahigh-viscosity magmalava broken into fragments

Answer 1

Mount St. Helens, Washington, is the most dynamic spring of gushing lava in the Cascade Range.

Its latest arrangement of ejections started in 1980 when a huge avalanche and ground-breaking dangerous emission made an expansive cavity, and finished 6 years after the fact after in excess of twelve expulsions of magma fabricated an arch in the pit.

Answer 2

Here is the answer to your question:

   quiet eruption

✔gentle lava flows

   magma low in silica

✔high-viscosity magma

   lava broken into fragments

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Mount Saint Helen is a stratovolcano (cone shape). These types of volcanoes have explosive eruptions. Explosive eruptions are not quiet eruptions. Due to its viscous lava flow (thick and sticky), lava flow is gentle. Mount Saint Helen has silica-rich magma which contributes to its explosive eruptions.