MX6 Reviewer G9

Volcanoes that have recently erupted are known as:

• Extinct Volcano
• Dormant Volcano
• Active Volcano
• What's a volcano?

__________ volcanoes are usually steep sided. They are formed from layers of ash and lava.

• Shield
• Cone
• Dormant
• Extinct

The Earth's crust is broken into pieces called

• glass

• rocks

• plates

• lava

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

• Aa
• Lava
• Magma
• Pahoehoe

What factor(s) determine(s) whether an eruption will be explosive?

• The amount of gases in the magma
• The amount of silica in the magma
• The amount of gas and silica in the magma
• None of these affect the explosiveness of the volcano

The more silica that magma contains...

• the thicker the magma
• the thinner the magma
• the higher the viscosity
• the runnier the magma

Shield volcanoes have:

• gently sloping sides
• a steep cone shape
• moderately sized sides
• long cracks along plate boundaries

Explosive eruption that hurls ash, gases, cinders, and bombs from the main vent.

• Volcano bomb
• Geyser
• Geothermal energy
• Pyroclastic flow

It is characterized by tall eruption columns that reach up to 20 km high with pyroclastic flow and ash fall tephra.

• Plinian

• Phreatic

• Strombolian

• Vulcanian

It is a violet eruption due to the contact between water and magma.

• Strombolian

• Phreatomagmatic

• Phreatic

• Plinian