What event triggered the main eruption of Mount St. Helens in May 1980?

A) Melting snow caused a huge steam eruption.
B) Magma encountered groundwater and exploded.
C) A landslide removed rocks and released pressure on the magma.
D) All of these are correct.


C) A landslide removed rocks and released pressure on the magma.

Environmental & Atmospheric Sciences

You might also like to view...

What is the map location of an earthquake called?

a. focus b. ground zero c. epicenter d. scarp e. nexus

Environmental & Atmospheric Sciences

Which of the following is the speed of light?

A) 3.0 x 10^8 cm/sec B) 3.0 x 10^8 m/sec C) 3.0 x 10^8 mi/sec D) 3.0 x 10^8 mi/hour

Environmental & Atmospheric Sciences

What is a flood?

A) When dry weather results in a high discharge B) When discharge in a river exceeds the river's capacity C) When a dam is constructed and forces sedimentation D) When changes in gradient result in the abandonment of meander loops

Environmental & Atmospheric Sciences

Of the following, ________ produce(s) the largest amount of hazardous waste

A) industry B) agriculture C) building demolitions D) utilities E) households

Environmental & Atmospheric Sciences