Volcanoes

What is Magma when it reaches the surface of Earth?

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

When an explosive eruption  forms a mixture of hot rock, ash, and gas, this material is called a...?

• Land slide
• Lava
• Eruption trail
• Pyroclastic flow

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

• Divergent Boundary
• Magma
• Subduction Boundary
• Volcano

The chain of volcanoes around the Pacific Ocean is called the ____.

• Ring of Fire

• Ring of Volcanoes

• Volcanoes of the Pacific

• Mordor

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

• Hot Spot
• Magma
• Lava
• Volcano

Tall, cone-shaped mountains in which layers of lava alternate with layers of ash

• Cinder Cone volcano
• Shield volcano
• Composite volcano
• Caldera

What is a huge hole left behind When a volcano has an enormous eruption and empties the magma chamber and the main vent.  The volcano becomes hollow and collapses leaving this hole behind

• Central vent
• Caldera
• Side vent
• Magma

A volcano that has gentle sloping sides and is formed from runny lava

• Shield volcano
• Cinder cone
• Composite
• None of these

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.

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

• Caldera
• Cinder Cone
• Composite Volcano
• Shield Volcano