Volcanoes Earth Science

Highly explosive volcanoes tend to have what type of magma?

• magma with high silica, high viscosity, and higher gas content
• magma with low silica, low viscosity, and lower gas content
• magma with low silica, high viscosity, and lower gas content
• magma with no silica, high viscosity, and no gas content

Which of the following do satellites detect to determine that a volcanic eruption will soon happen?

• Slope deformation
• Temperature changes
• Gases being given off
• All of these

Which of the following forms from large amounts of fluid lava over an extensive area?

• Lava Dome
• Lava Plateau
• New Land
• Volcano

Which type of magma has the lowest amount of silica content?

• Andesitic Magma
• Basaltic Magma
• Rhyolitic Magma
• Viscous Lava

What type of volcano is made of lava fragments that have been ejected from a volcanic vent?

• Caldera
• Cinder Cone
• Composite Volcano
• Shield Volcano

Where do volcanoes come from?

• Places where plates move apart
• Places where plates are moving together
• Hot Spots
• All of these options

How thick something is or the ability of a fluid or liquid to flow is its 

• viscosity
• density
• velocity 
• flowability 

What kind of volcano is made of alternating layers of lava and tephra? (also called  a stratovolcano)

• shield
• composite
• cinder cone

What are the most explosive types of volcanoes?

• Shield
• Composite
• Cinder Cone

What is a determining factor in which type of eruption will occur?

• the composition of the magma
• the size of the mountain
• the climate around the volcano
• the number of people living near the volcano