Sci Chp 8 # 4: Volcanic Hazards

What is a volcanic hazard?

• A volcanic hazard is any potential danger or threat posed by volcanic activity.
• A volcanic hazard is a geological feature caused by erosion.
• A volcanic hazard is a man-made disaster.
• A volcanic hazard is a type of weather phenomenon.

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What is a pyroclastic flow?

• A pyroclastic flow is a term used to describe the movement of lava during a volcanic eruption.
• A pyroclastic flow refers to the mixture of gas, rock fragments, and lava that can erupt from a volcano.

• A pyroclastic flow is a type of cloud formation that occurs after a volcanic eruption.
• A pyroclastic flow is a slow-moving current of cold gas and volcanic matter that flows up the side of a volcano during an eruption.

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NGSS.MS-ESS2-2

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What is the difference between a pyroclastic flow and a pyroclastic surge?

• Pyroclastic flows move along the ground, while pyroclastic surges move above the ground.
• Pyroclastic flows are composed of gas, while pyroclastic surges are composed of solid particles.
• Pyroclastic flows move faster than pyroclastic surges.
• Pyroclastic flows are less destructive than pyroclastic surges.

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NGSS.MS-ESS2-2

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What is tephra?

• Large chunks of rocks and debris that are ejected from a volcano

• A type of cloud formation
• A type of sedimentary rock
• A type of soil erosion

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Why are lava flows less dangerous than other volcanic hazards?

• Lava flows are less dangerous because they are invisible
• Lava flows are less dangerous than other volcanic hazards because they move slowly and follow predictable paths.
• Lava flows are less dangerous because they are unpredictable
• Lava flows are less dangerous because they are cold