SJI 9 - SCI Q3 CHAPTER 2

What is a volcanic eruption?

• The formation of new mountains

• The release of lava and ash from a volcano

• A tectonic plate movement

• The cooling of magma beneath the surface

What causes magma to rise to the surface?

• Gravity pulling it upward

• Its buoyancy and heat

• External pressure from the atmosphere

• The cooling of Earth's crust

What happens when magma has low viscosity and little gas?

• Effusive eruption

• Explosive eruption

• Phreatic eruption

• Strombolian eruption

Which of the following best describes an explosive eruption?

• Lava flows smoothly like a river

• Lava fountains and mild eruptions

• Ash clouds are sent high into the atmosphere

• Magma flows with little to no gas

Which volcanic eruption occurred in 1991?

• Taal Volcano Eruption

• Mayon Volcano Eruption

• Mt. Pinatubo Eruption

• Hawaii Volcano Eruption

What type of eruption results in pyroclastic flows?

• Effusive eruption

• Explosive eruption

• Phreatomagmatic eruption

• Strombolian eruption

Which volcano is known for effusive eruptions?

• Mt. Pinatubo

• Taal Volcano

• Mauna Loa

• Mayon Volcano

Which phase involves the magma chamber being filled with magma?

• Eruption phase

• Preparation phase

• Ending phase

• Dormant phase

What is formed when the walls of a volcanic conduit collapse?

• A magma chamber

• A vent

• A caldera or crater

• A dome

Which type of eruption is driven by steam from heated groundwater?

• Phreatic eruption

• Plinian eruption

• Vulcanian eruption

• Pelean eruption