Volcanoes

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

• Hot Spot
• Magma
• Lava
• 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.

What is the principal ingredient to all types of magma?

• Iron
• Magnesium
• Silica
• Water

What are solid rock fragments that are ejected during a volcanic eruption?

• Lahar

• Magma
• Pyroclastic Material
• Silica

What type of volcano has steep slopes made of alternating layers of ash and silica rich lava?

• Caldera
• Cinder Cone
• Composite Volcano
• Shield Volcano

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

• Caldera
• Cinder Cone
• Composite Volcano
• Shield Volcano

What type of volcano is Kilauea, which is located in Hawaii?

• Caldera
• Cinder Cone
• Composite Volcano
• Shield Volcano

Where are most volcanoes found?

• Southern Hemisphere
• Ring of Fire
• Mid-Atlantic Ridge
• Hot Spots

What is molten rock that has reached the Earth's surface?

• Aa
• Lava
• Magma
• Pahoehoe

What is the definition of dormant?

• sleeping
• extinct
• active
• invisible