15 Questions
What is the Greek meaning of the word 'pyroclastic'?
Broken pieces of fire
What is the characteristic of lapilli when they cool quickly in the air?
Glassy and tear-shaped
What is another term for a 'nuee ardente'?
Block-and-ash flow
What is the main reason for the red glow in a nuee ardente (pyroclastic flow)?
Dense, uncooled lava fragments
What are the major components of a pyroclastic flow?
Rocks, gases, and lava fragments
What is the main characteristic of ignimbrites?
Contain a high percentage of pumice and ash
How are ignimbrites described etymologically?
Rain of fire
What distinguishes a pyroclastic surge from other volcanic flows?
Higher proportion of gases and fewer solid particles
Where does a ground surge pyroclastic surge occur?
On the ground at the base of the pyroclastic flow
Why are pyroclastic surges considered extremely dangerous?
Move very quickly and are turbulent
What is the main difference between a pyroclastic flow and a lava flow?
Pyroclastic flows consist of ash, hot gases, and rock fragments, whereas lava flows consist of molten rock.
What type of eruption typically generates pyroclastic flows?
Vulcanian eruption
Which scenario describes one way that pyroclastic flows form?
Violently expelling atmosphere during the initial eruptive stage
What is a lava dome?
Solidified mound around the volcano's vent
In which scenario would a pyroclastic flow be generated due to a collapse?
Lava dome growing too steep and collapsing
Learn how pyroclastic flows are formed during volcanic eruptions, consisting of ash, hot gases, and rock fragments flowing down the volcano's slope. Understand the difference between pyroclastic flows and lava flows.
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