Understanding Volcanoes

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What is the main reason why pyroclastic surges are more dangerous to humans compared to pyroclastic flows?

Pyroclastic surges contain poisonous gases and steam that can suffocate people. (correct)

Pyroclastic flows travel at higher speeds than pyroclastic surges.

Pyroclastic surges can travel farther away from the volcano than pyroclastic flows.

Pyroclastic surges are less likely to cause death than pyroclastic flows.

What is the main difference between pyroclastic flows and tephra?

Pyroclastic flows are propelled at higher speeds than tephra.

Tephra are associated with more poisonous gases than pyroclastic flows.

Pyroclastic flows have larger solid particles compared to tephra.

Tephra are larger chunks of rocks ejected from a volcano compared to pyroclastic flows. (correct)

Which volcanic eruption resulted in the destruction of the city of Saint Pierre and the death of more than 29,000 people due to a pyroclastic surge?

Mount Tambora eruption in 1815

Mount Etna eruption in 1669

Mount Pelee eruption in 1902 (correct)

Taal Volcano eruption in 1911

Why is tephra particularly destructive to individuals and their property?

Their huge size and weight make them destructive upon impact. (B) Signup and view all the answers

What impact can the thick layers of ash associated with tephra have on respiratory health?

They can significantly impact respiratory health across a wide region. (D) Signup and view all the answers

How did tephra contribute to the death of nearly 80,000 people during the 1815 Tambora eruption?

By destroying food supplies due to vegetation destruction. (A) Signup and view all the answers

What happens when tephra is ejected high into the atmosphere during a volcanic eruption?

It becomes electrically charged and can produce lightning. (B) Signup and view all the answers

What is a potential hazard associated with tephra that has caused fatalities in volcanic eruptions like Mount Pelee and Tambora?

Lightning strikes that result in fatalities. (D) Signup and view all the answers

Apart from destruction, what was another impact of tephra during the Tambora eruption?

Famine due to loss of food supplies (C) Signup and view all the answers

What is the main reason why pyroclastic surges are more likely to cause death in humans?

The combination of poisonous gases and steam in the pyroclastic clouds (D) Signup and view all the answers

What is the main characteristic that distinguishes tephra from pyroclastic flows?

Tephra consists of much larger chunks of rocks and debris (B) Signup and view all the answers

What were the primary factors that caused the death of 1,335 individuals during the 1911 Taal Volcano eruption?

Toxic gases and ash ejected from the volcano (D) Signup and view all the answers

How do tephra travel long distances and cause significant destruction?

By being propelled at high speeds from the volcano (D) Signup and view all the answers

What makes tephra particularly destructive to individuals and their property?

The large size and weight of tephra pieces (D) Signup and view all the answers

What makes pyroclastic surges more lethal to humans compared to pyroclastic flows?

The steam and gases in the pyroclastic clouds (A) Signup and view all the answers

During a volcanic eruption, what is one of the potential hazards associated with tephra expulsion?

Creation of volcanic lightning strikes near the volcano (A) Signup and view all the answers

Why are pyroclastic surges considered particularly hazardous?

They release toxic gas clouds that spread quickly post-eruption (C) Signup and view all the answers

Which characteristic makes tephra particularly dangerous for those near a volcanic eruption?

The high speeds at which tephra travels away from the volcano. (D) Signup and view all the answers

What factor contributed significantly to the deaths associated with tephra during volcanic eruptions like Mount Pelee and Tambora?

The toxic combination of gases in tephra. (B) Signup and view all the answers

Understanding Volcanoes

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Questions and Answers

What is the main reason why pyroclastic surges are more dangerous to humans compared to pyroclastic flows?

What is the main difference between pyroclastic flows and tephra?

Which volcanic eruption resulted in the destruction of the city of Saint Pierre and the death of more than 29,000 people due to a pyroclastic surge?

Why is tephra particularly destructive to individuals and their property?

What impact can the thick layers of ash associated with tephra have on respiratory health?

How did tephra contribute to the death of nearly 80,000 people during the 1815 Tambora eruption?

What happens when tephra is ejected high into the atmosphere during a volcanic eruption?

What is a potential hazard associated with tephra that has caused fatalities in volcanic eruptions like Mount Pelee and Tambora?

Apart from destruction, what was another impact of tephra during the Tambora eruption?

What is the main reason why pyroclastic surges are more likely to cause death in humans?

What is the main characteristic that distinguishes tephra from pyroclastic flows?

What were the primary factors that caused the death of 1,335 individuals during the 1911 Taal Volcano eruption?

How do tephra travel long distances and cause significant destruction?

What makes tephra particularly destructive to individuals and their property?

What makes pyroclastic surges more lethal to humans compared to pyroclastic flows?

During a volcanic eruption, what is one of the potential hazards associated with tephra expulsion?

Why are pyroclastic surges considered particularly hazardous?

Which characteristic makes tephra particularly dangerous for those near a volcanic eruption?

What factor contributed significantly to the deaths associated with tephra during volcanic eruptions like Mount Pelee and Tambora?

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