Author Question: Which option best describes the direction of the eruption of Mount St. Helens and the cause of this ... (Read 43 times)

CQXA · **on:** Jul 16, 2018

Which option best describes the direction of the eruption of Mount St. Helens and the cause of this action, according to Figure 15.24 in your textbook?

A) Magma pressure built up and caused a vertical eruption of magma and ash.
B) A rock slide released pressure on the magma, causing a horizontal eruption.
C) An earthquake sheared off part of the mountain, causing a horizontal eruption.
D) An earthquake opened a vent in the top of the mountain, releasing pressure on the magma and causing a vertical eruption.

Question 2

Put the following events in order from those that occur with the greatest driving force to those that occur with the least driving force and/or have the least effect on hillside stability.

1. erosion 2. magma intrusion 3. volcanic eruption 4. liquefaction 5. earthquake
A) 1, 2, 3, 5, 4
B) 2, 1, 4, 5, 3
C) 3, 4, 5, 2, 1
D) 4, 5, 2, 3, 1