Mount Saint Helens Volcanic Eruption Quiz

What is the main focus of the episode?

• The history of volcanic eruptions in the United States

• The scientific study of volcanic gases

• The geological mysteries left behind by volcanic events

• The impact of volcanic eruptions on wildlife

What was the deadliest and most destructive volcanic event in U.S history?

• Hawaii volcano eruption

• California volcanic blast

• Mount St. Helens eruption

• Lawson Peak eruption

What was the first known eruption of Mount St. Helens witnessed by local tribes?

• 123 years ago

• 1857

• 1915

• 1980

What was the main cause of the bulge growing on the north face of the mountain?

• Rising magma

• Earthquakes

• Landslides

• Gas emissions

What was the magnitude of the earthquake that caused the north flank to break loose?

• 4.5

• 4.2

• 5.1

• 5.2

What was the estimated amount of rock that slid down the mountain during the eruption?

• One cubic mile

• Half a cubic mile

• Two-thirds of a cubic mile

• One-third of a cubic mile

What caused the yellow discoloration of the rock in the crater wall?

• Chemical reaction with air

• Interaction with glacial water

• Exposure to sunlight

• Contact with volcanic ash

What was the main reason for the limited access to the area around the volcano before the eruption?

• Wildlife conservation efforts

• Preventive measures for landslides

• To study the geological mysteries

• To protect the recreational paradise

What was the main focus of the scientific study before the eruption?

• Deformation of the mountain

• Earthquake patterns

• Wildlife observation

• Gas emissions

What was the impact of the eruption on the landscape?

• Formation of new lakes

• Complete destruction of the mountain

• Creation of a new mountain range

• Transformation of the valley into a hilly terrain