Volcanoes Quiz

What is the molten rock called when it is beneath the surface of the Earth?

• Magma
• Lava
• Ash
• Rock

How many volcanoes on Earth are considered active?

• 1,000
• 5,000
• 10,000
• 1,900

What are the two types of plate boundaries that are most likely to produce volcanic activity?

• Divergent and Convergent
• Transform and Convergent
• Divergent and Transform
• Convergent and Subduction

Which ocean is home to the Mid-Atlantic Ridge?

• Atlantic Ocean
• Pacific Ocean
• Indian Ocean
• Arctic Ocean

Which type of volcano is characterized by steep, conic peaks and layers of lava, volcanic ash, and fragmented rocks?

• Stratovolcano
• Shield Volcano
• Pyroclastic Cone
• Lava Dome

Which type of volcano is built almost exclusively of lava and has a gently sloping dome shape?

• Stratovolcano
• Shield Volcano
• Pyroclastic Cone
• Lava Dome

What is the term for circular depressions created when the land around a volcano collapses inwardly?

• Craters
• Calderas
• Lahars
• Pyroclastic Flows

Which type of eruption is the largest and releases a deadly mixture of lava, ash, and volcanic rocks?

• Hawaiian
• Strombolian
• Vulcanian
• Plinian

What volcanic hazard can cause complete darkness and inhibit air traffic?

• Volcanic Gas
• Landslides
• Pyroclastic Flows
• Volcanic Ash

What international organization documents current volcanic activity and keeps an archive of volcanic activity from the last 10,000 years?

• Smithsonian Institution's Global Volcanism Program
• International Association of Volcanology and Chemistry of the Earth's Interior
• United Nations International Decade for Natural Disaster Reduction
• International Decade for Natural Disaster Reduction