Dynamic Earth Test Review (Test Fri 5/23)

What is the best definition of a volcano?

• A hill made only of dirt and grass

• A mountain that forms when rocks fall from space

• A mountain or opening in Earth's surface where magma, gases, and ash can escape

• A large hole filled with water at the top of a mountain

Why are most volcanoes found near tectonic plate boundaries?

• Because those areas are colder and more rocky

• Because plates move and allow magma to escape from the mantle

• Because that's where weather happens the most

• Because plates are stronger there and hold more water

What is the "Ring of Fire"?

• A ring of forest fires around the equator

• A famous volcano in Europe

• An area in the Pacific Ocean with many volcanoes and earthquakes

• A type of volcanic eruption

Which of these volcano types is wide and gently sloping, with slow-flowing lava?

• Composite volcano

• Cinder cone volcano

• Shield volcano

• Stratovolcano

Which type of volcano is tall, steep, and made of layers of lava and ash?

• Shield volcano

• Composite volcano

• Dome volcano

• Rift volcano

Which type of volcano is small, steep, and formed from explosive eruptions of ash and rock?

• Cinder cone

• Shield volcano

• Composite volcano

• Lava dome

What is magma?

• Hot rock on Earth’s surface

• Solid rock in the crust

• Liquid rock found beneath Earth’s surface

• A type of cloud above volcanoes

What do we call magma after it erupts onto the surface?

• Lava

• Ash

• Rock

• Crust

Why do volcanoes erupt?

• The mountain grows too tall and tips over

• Winds push magma out of the ground

• Pressure builds up from magma and gases beneath Earth’s surface

• The sun heats the ground until it explodes

What is volcanic ash dangerous to?

• Only animals

• Airplanes, lungs, and buildings

• Rainforests

• Rocks and minerals underground