Volcanic Eruptions and Their Characteristics

Miss Kelly provides an overview of volcanoes, explaining the movement of magma and its transformation into lava. She discusses major volcanic zones, including mid-ocean ridges and subduction zones, and explains the types of volcanoes: shield, cinder cone, and composite. The video also covers factors affecting eruptions, such as magma composition and viscosity, and concludes with a brief discussion on igneous rocks formed from lava and magma.

What is the term for magma once it reaches the Earth's surface?

• Ash

• Rock

• Lava

• Sediment

Where do major volcanic zones typically occur?

• In polar regions

• At the equator

• In mid-ocean ridges

• In deserts

What type of plate movement is associated with mid-ocean ridges?

• Convergent

• Divergent

• Transform

• Static

Which type of plate boundary is associated with subduction zones?

• Transform

• Convergent

• Static

• Divergent

What is a key factor that determines the violence of a volcanic eruption?

• Magma color

• Magma composition

• Magma age

• Magma location

What does high silica content in magma result in?

• Low viscosity

• No change

• Increased temperature

• High viscosity

Which type of volcano is characterized by quiet lava flows and a dome shape?

• Cinder cone

• Composite

• Shield

• Stratovolcano

What is a characteristic of cinder cone volcanoes?

• Quiet eruptions

• Explosive eruptions

• Flat shape

• No eruptions

What is another name for composite volcanoes?

• Cinder cones

• Lava domes

• Shield volcanoes

• Stratovolcanoes

What type of rock is formed from above-ground lava?

• Extrusive igneous

• Intrusive igneous

• Sedimentary

• Metamorphic