Which of the following scenarios best describes the creation of the lahars associated with the eruption of Mt.St.Helens in 1980?
A)Hot gases melted the volcano's snowcap, generating meltwater that mixed with ash.
B)A volcanic flank collapsed in a landslide, which flowed into Spirit Lake.
C)Ash deposited during the eruption was remobilized by a flood years later.
D)The eruption deposited fine ash in the Toutle River.

Question

Quizplus · Accepted Answer

The collapse of the volcano's flank in a massive landslide during the eruption flowed into Spirit Lake and down the Toutle River, creating lahars.

Which of the Following Scenarios Best Describes the Creation of the Lahars