Quiz on Volcanoes

What is a volcano?

• A type of earthquake

• A mountain formed by the eruption of magma

• A deep ocean trench

• A fault line in the Earth's crust

What is the primary reason magma rises to the Earth's surface?

• It is denser than the surrounding rocks

• It is pushed by ocean currents

• It contains dissolved gases and is less dense than the surrounding materials

• It is heavier than the Earth's crust

At which plate boundaries do most volcanoes form?

• Transform boundaries

• Convergent and divergent boundaries

• Continental-continental collision zones

• Mid-ocean ridges only

What happens at a divergent plate boundary to cause volcanic activity?

• Plates move toward each other, creating subduction

• Plates move apart, allowing magma to rise and erupt

• Plates slide past each other, generating frictional heat

• Continental plates collide, forming mountains

How do volcanoes form at convergent plate boundaries?

• Plates move apart, causing magma to rise

• The denser plate subducts, melts, and forms magma that rises

• Plates slide past each other, creating frictional heat

• Magma seeps through faults in the crust

What is the main difference between stratovolcanoes and shield volcanoes?

• Shield volcanoes have steep sides, while stratovolcanoes have gentle slopes

• Stratovolcanoes have alternating layers of lava and ash, while shield volcanoes have only lava layers

• Stratovolcanoes form at divergent boundaries, while shield volcanoes form at convergent boundaries

• Shield volcanoes erupt explosively, while stratovolcanoes erupt effusively

Which type of volcano generally produces violent eruptions?

• Shield volcano

• Stratovolcano

• Cinder cone volcano

• Hotspot volcano

What is a characteristic feature of a shield volcano?

• Steep sides and narrow summit

• Alternating layers of lava and ash

• Gently sloping sides with a broad summit

• Tall, cone-shaped structure

Which of the following volcanoes is an example of a stratovolcano?

• Mauna Loa

• Mount Mayon

• Kīlauea

• Réunion Volcano

What type of lava is most commonly associated with shield volcanoes?

• High silica, high viscosity lava

• Low silica, low viscosity lava

• Lava mixed with ash and gases

• Superheated ash clouds