Magma Types and Volcanoes

Which of the following terms are used to describe a volcano that may erupt at any time? 

• Dormant volcano
• Active volcano
• Extinct volcano
• Shield volcano

Which of the following terms are used to describe a volcano that is has not recently erupted, but may in the future? (aka sleeping volcano)

• Composite volcano
• Active volcano
• Extinct volcano
• Dormant volcano

What is the difference between magma and lava? 

• Where it is found (above or below the surface)
• How hot the molten rock is (lava is hotter than magma)
•  The type of boundary where it forms
• The viscosity of the molten rock (lava has a lower viscosity)

What type of volcano is created when a volcano erupts and releases lava, which then hardens over previous lava over millions of years? 

• Composite
• Caldera
• Cinder Cone
• Shield

Which ingredient in magma determines whether an eruption is explosive or quiet?

• Amount of rock.
• Amount of magma.
• Amount of obsidian rock.
• Amount of silica.

What causes a volcano to erupt? (Hint: Think of a soda can)

• Expanding gases
• Expanding magma
• Expanding lava
• Expanding silica

Which statement is "true" about predicting volcanic eruptions?

• Geologists predict them easier.
• Geologist predict how powerful they are.
• Geologist can predict the type of eruption.
• Geologist never have any warning.

Which type of volcano can alternates between explosive and non-explosive eruptions? 

• Composite Volcano
• Shield Volcano
• Cinder Cone Volcano

Which type of volcano erupts with both lava and pyroclastic flows (dust, gas and rock particles)? 

• Composite Volcano
• Shield Volcano
• Cinder Cone Volcano

What type of volcano is shown on the model above? 

• Shield Volcano
• Composite Volcano
• Cinder Cone Volcano