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.
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
Of the following, ________ produce(s) the largest amount of hazardous waste
A) industry B) agriculture C) building demolitions D) utilities E) households
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
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