Volcano Monitoring Quiz

What was the explosive force of the Mount St. Helens eruption equivalent to?

• 10 million tons of TNT

• 50 million tons of TNT

• 5 million tons of TNT

• 24 million tons of TNT

Who was the 30-year-old volcanologist from the US Geological Survey mentioned in the text?

• Michael Brown

• John Smith

• David Johnston

• Patricia Nado

What type of volcano is Mount St. Helens?

• Lava dome

• Cinder cone

• Shield volcano

• Stratovolcano

What is considered an active volcano?

• Any volcano located near tectonic plate boundaries

• Any volcano with a visible crater

• Any volcano that has erupted in historical times

• Any volcano with a height over 1,000 meters

What is a lahar?

• A type of volcanic rock

• A volcanic mudflow

• A small volcanic eruption

• A type of lava

What can indicate an impending volcanic eruption?

• Decreased ground temperatures

• Decreased ground deformation

• Decreased sulfur dioxide emissions

• Increased seismic activity

What is the primary threat from Mount Rainier?

• Volcanic mudflow or lahar

• Ash cloud

• Lava flow

• Cataclysmic eruption

What type of volcano is formed by runny lava?

• Shield volcano

• Cinder cone

• Stratovolcano

• Lava dome

How many active volcanoes are estimated to be on Earth currently?

• 500

• 2,500

• 1,500

• 3,500

What technology is used to measure ground deformation in volcanoes?

• Seismographs

• Barometers

• GPS systems and satellite imagery

• Thermal cameras