Pyroclastic Flow Formation

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What is the Greek meaning of the word 'pyroclastic'?

Toxic gases

Broken pieces of fire (correct)

Molten lava

Volcanic cloud

What is the characteristic of lapilli when they cool quickly in the air?

Filament-shaped due to wind

Diamond-shaped

Spherical shape

Glassy and tear-shaped (correct)

What is another term for a 'nuee ardente'?

Tephra cloud

Pumice flow

Block-and-ash flow (correct)

Lava dome collapse

What is the main reason for the red glow in a nuee ardente (pyroclastic flow)?

Dense, uncooled lava fragments Signup and view all the answers

What are the major components of a pyroclastic flow?

Rocks, gases, and lava fragments Signup and view all the answers

What is the main characteristic of ignimbrites?

Contain a high percentage of pumice and ash Signup and view all the answers

How are ignimbrites described etymologically?

Rain of fire Signup and view all the answers

What distinguishes a pyroclastic surge from other volcanic flows?

Higher proportion of gases and fewer solid particles Signup and view all the answers

Where does a ground surge pyroclastic surge occur?

On the ground at the base of the pyroclastic flow Signup and view all the answers

Why are pyroclastic surges considered extremely dangerous?

Move very quickly and are turbulent Signup and view all the answers

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. Signup and view all the answers

What type of eruption typically generates pyroclastic flows?

Vulcanian eruption Signup and view all the answers

Which scenario describes one way that pyroclastic flows form?

Violently expelling atmosphere during the initial eruptive stage Signup and view all the answers

What is a lava dome?

Solidified mound around the volcano's vent Signup and view all the answers

In which scenario would a pyroclastic flow be generated due to a collapse?

Lava dome growing too steep and collapsing Signup and view all the answers

Pyroclastic Flow Formation

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