15 Questions
What is the primary cause of volcanic activity on Earth?
The interaction of tectonic plates at divergent and subduction boundaries
Which of the following is not a type of volcano mentioned in the text?
Caldera volcano
What is the difference between magma and lava?
Magma is molten rock beneath the Earth's surface, while lava is molten rock on the surface
Which of the following best describes a cinder-cone volcano?
A steep, conical structure
In addition to molten rock, what other materials can volcanoes eject?
Steam, ash clouds, and super-heated rock fragments
What is the primary difference between a lava flow and a pyroclastic flow?
A pyroclastic flow contains a higher percentage of solid materials than a lava flow.
What is the meaning of the term 'pyroclastic'?
It refers to the combination of heated rock and gas in a pyroclastic flow.
Which of the following is NOT a potential hazard associated with a pyroclastic flow?
Flooding caused by melting glaciers
What is the primary difference between a pyroclastic flow and a pyroclastic surge?
A pyroclastic surge is comprised primarily of gases, while a pyroclastic flow contains more solid materials.
Which of the following historical volcanic eruptions is NOT mentioned in the text as an example of a pyroclastic flow?
Mount Vesuvius in Italy in 79 AD
What is the primary reason pyroclastic surges are more likely to cause death in humans compared to pyroclastic density currents?
Pyroclastic surges contain poisonous gases and steam.
Which of the following statements about tephra is true?
Tephra can weigh up to 30 tons and travel at high speeds.
What potential hazard associated with tephra is mentioned in the text?
Tephra can produce lightning strikes.
What was a consequence of the tephra produced during the 1815 eruption of Tambora?
It destroyed vegetation, leading to famine and loss of life.
Why are pyroclastic density currents able to affect a smaller area than pyroclastic surges, according to the text?
They contain fewer solid particles, allowing gas to dissipate more quickly.
Explore the different types of materials that erupt from volcanoes and their potential for causing volcanic hazards. Test your knowledge on volcanic hazards, lava flows, and the byproducts of volcanic activity in this quiz!
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