Volcanoes

This is the name for the chain of volcanoes and earthquakes around the edge of the Pacific Plate.

• The Subduction Zone

• The Ring of Fire

• The Seismic-Tectonic Area

What is magma called when it reaches the surface of Earth?

• Lava

• viscosity

• toxic gas

How much ___ that is in a volcano's magma helps to decide whether it will be explosive or quiet.

• silica

• rock

• air holes

• soil

What is a volcano?

• A weak spot in Earth’s crust where magma can come to the surface.

• A mix of rocks, minerals, gases, and water from the mantle.

• Hot semifluid rock that becomes solid rock as it cools off.

• A special kind of mountain.

Where do volcanoes typically form?

• At plate boundaries.

• In the middle of tectonic plates.

What is an extinct volcano?

• A volcano that has erupted at least once in the last 10,000 years.

• A volcano that hasn’t erupted in the last 10,000 years, but could still erupt.

• A volcano that should never erupt again.

What kind of volcano is this?

• Stratovolcano

• Shield volcano

• Cinder cone volcano

What kind of volcano is this?

• Stratovolcano

• Shield volcano

• Cinder cone volcano

Which volcano is best known for steep slopes, high elevation, and the potential for explosive eruptions?

• Cinder cone volcano

• Composite volcano

• Shield volcano

• Exploding volcano

How would you describe highly viscous magma?

• Flowing & hot

• Chunky & gobby

• Thin & runny

• Thick & sticky