Volcano Quick Check

What is a volcano?

• A deep trench in the ocean floor

• A large body of water

• A type of storm with high winds

• A mountain that can erupt with lava, ash, and gases

What is a hot-spot volcano?

• A hot-spot volcano is formed by the collision of two tectonic plates.
• A hot-spot volcano forms above a hot mantle plume, usually away from the edges of a plate boundary

• A hot-spot volcano is caused by excessive magma in the upper mantle.

• A hot-spot volcano has hotter than average magma in it

What is the difference between magma and lava?

• Magma is above the Earth's surface, lava is below

• Magma is hotter than lava

• Magma is liquid, lava is solid

• Magma is below the Earth's surface, lava is above

Where are most volcanoes found?

• In the desert

• Where tectonic plates meet

• In polar regions

• In deep oceans

What percentage of the Earth's active volcanoes are in the Ring of Fire?

• About 85%

• About 50%

• About 65%

• About 75%

What is an island arc volcano?

• A volcano formed by the collision of two continental plates

• A volcano that forms when one oceanic plate subducts under another oceanic plate

• A volcano that forms under the sea

• A volcano that forms in the middle of a tectonic plate

How are the islands of Hawaii formed?

• By island arc volcanism

• By subduction zones

• By hot spots

• By rift volcanism

What is a shield volcano?

• A volcano with steep sides and explosive eruptions

• A volcano with gentle slopes formed by lava flows

• A volcano that forms underwater

• A small volcano that erupts ash and cinders

What causes a caldera to form?

• The eruption of a shield volcano

• The collapse of a volcano's magma chamber

• The formation of a new tectonic plate

• The cooling of lava on the surface

What is a composite volcano?

• A steep-sided volcano formed from layers of ash and lava

• A volcano that only erupts underwater

• A volcano that has erupted only once

• A volcano formed by a single eruption