Practice: Volcanoes

What is the definition of dormant?

• sleeping
• extinct
• active
• invisible

What is the opening that extends from the magma chamber to the top of the volcano called?

• magma
• lava
• vent 
• crater

What is Magma when it reaches the surface of Earth?

• Lava
• Mafic Magma
• Felsic Magma
• None of these

This is the name for the chain of volcanos around the edge of the Pacific Plate.

• Circle of Fire
• Ring of Lava
• Ring of Fire
• Circle of Magma

Volcanoes are found...

• on land
• under water
• on islands
• all of the above

What is molten rock that has formed deep within the Earth?

• Hot Spot
• Magma
• Lava
• Volcano

What is the opening in Earth's crust through which molten rock, gases, and ash erupt?

• Divergent Boundary
• Magma
• Subduction Boundary
• Volcano

Why does magma tend to rise to the surface?

• It has large amounts of silica.
• It contains very little silica.
• It is denser than the surrounding material.
• It is less dense than the surrounding material.

The formation of magma depends on which set of conditions?

• Pressure, Density, and Water Content
• Temperature, Density, and Pressure
• Temperature, Density, and Water Content
• Temperature, Pressure, and Water Content

What kind of magma produces violent volcanic eruptions?

• Magma low in silica
• Magma that is fluid, and runny
• Magma that is high in gas content
• Magma rich in iron