Volcanic Eruptions and Their Impact

How many potentially active volcanoes are there in the United States?

• 160

• 1500

• 57

• 85

What is the most widespread hazard of volcanic eruptions?

• Lava flows

• Volcanic ash

• Earthquakes

• Tsunamis

Why is volcanic ash particularly dangerous for aircraft?

• It causes turbulence

• It can melt in jet engines

• It reduces visibility

• It attracts lightning

What happened to a Boeing 747 flying over Redoubt Volcano in 1989?

• It flew into the ash cloud and experienced engine flameout

• It crashed into the volcano

• It was struck by lightning

• It safely avoided the ash cloud

What is the purpose of the US Geological Survey Spider?

• To predict volcanic eruptions

• To measure ground motion and other data

• To capture images of eruptions

• To provide shelter during eruptions

Why is it challenging to place monitoring equipment on every volcano?

• Insufficient technology

• Remote and unsafe locations

• Lack of funding

• Political restrictions

What initially intrigued scientists about volcanic lightning?

• Its color

• Its occurrence during explosive eruptions

• Its unpredictability

• Its frequency

How do volcanic ash particles contribute to lightning formation?

• By creating a static charge

• By attracting water vapor

• By absorbing sunlight

• By releasing gases

What is a lahar?

• A volcanic mudflow

• A type of lava

• A type of volcanic rock

• A volcanic gas

What is the best way to prepare for a volcanic eruption?

• Stockpile food and water

• Evacuate immediately

• Know your local hazards and check maps

• Build a shelter