Volcanic Eruption Hazards

What are geological processes?

• Naturally occurring events that impact the geology of the Earth

• Man-made events that impact the geology of the Earth

• Events that only occur in specific regions

• Events that have no impact on the geology of the Earth

How do you define geologic hazards?

• An extreme natural event that poses a threat to life and property

• A man-made event that poses a threat to life and property

• An event that only occurs in specific regions

• An event that has no impact on life and property

What are examples of geologic hazards?

• Earthquakes, volcanic eruptions, tsunamis, and landslides

• Floods, droughts, and hurricanes

• Tornadoes, hailstorms, and blizzards

• Forest fires, heatwaves, and lightning strikes

What is a volcano?

• A vent or fissure in the Earth's crust through which lava, ash, rock, and gases erupt

• A man-made structure that releases lava and gases

• A large body of water surrounded by land

• A type of mountain formed by erosion

What are the hazards caused by volcanic eruptions?

• Tephra falls, pyroclastic flows, lahars, floods, and poisonous gases

• Earthquakes, tsunamis, and landslides

• Droughts, heatwaves, and wildfires

• Hurricanes, tornadoes, and hailstorms

Which of the following describes tephra?

• Pyroclastic fragments of any size and origin

• A type of lava flow

• A poisonous gas released during volcanic eruptions

• A type of volcanic rock

Which of the following statements explains pyroclastic flow?

• A dense, fast-moving flow of solidified lava pieces, volcanic ash, and hot gases

• A type of volcanic bomb

• A poisonous gas released during volcanic eruptions

• A type of volcanic rock

What is a lahar?

• A hot or cold mixture of water and rock fragments that flows down the slopes of a volcano

• A type of volcanic bomb

• A poisonous gas released during volcanic eruptions

• A type of volcanic rock

What is a flood?

• An overflow of water that submerges land that is usually dry

• A type of volcanic bomb

• A poisonous gas released during volcanic eruptions

• A type of volcanic rock

What are lava domes?

• Formed by viscous magma being erupted effusively onto the surface and then piling up around the vent

• A type of volcanic bomb

• A poisonous gas released during volcanic eruptions

• A type of volcanic rock