Question

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

Answer 1

The phrase that best describes the eruption of Mount St. Helens in 1980 is **high-viscosity magma**. This type of magma, which is rich in silica, results in explosive eruptions, such as the one that occurred at Mount St. Helens.