The May 18, 1980, eruption of Mount St. Helens was unique in which way?
A)Lava flows erupted from the base of the volcano.
B)The explosion was initially directed sideways.
C)Large amounts of gases were emitted.
D)The explosion was directed vertically only.

Question

Quizplus · Accepted Answer

The May 18, 1980, eruption of Mount St. Helens was unique in that the explosion was initially directed sideways. This lateral blast was caused by the eruption of hot gases and ash from the volcano, which created a landslide and lateral blast that traveled at high speed, devastating the surrounding area. It was the first time such a lateral blast had been observed in the history of recorded volcanic eruptions.

The May 18, 1980, Eruption of Mount St