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Pyroclastic Flow

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Questions and Answers

What is the main difference between ignimbrites and nuee ardente flows?

Ignimbrites are deposits that contain a higher proportion of gases, while nuee ardente flows are made mostly of solid particles.

Ignimbrites are deposits for pumice flows, while nuee ardente flows are deposits for ash clouds.

Ignimbrites can vary in length from a few kilometers to tens of kilometers, while nuee ardente flows are confined to flowing downslope.

Ignimbrites contain a high percentage of pumice and ash, while nuee ardente flows are low density and move quickly. (correct)

What is the etymology of the word 'ignimbrite'?

From the Latin words ignis - meaning wind, imbris - meaning fire.

From the Latin words igni - meaning water, imbri - meaning fire.

From the Latin words igni - meaning fire, imbri - meaning rain. (correct)

From the Latin words ignis - meaning fire, imbris - meaning earth.

What is a pyroclastic surge characterized by?

A pyroclastic surge is a high density flow of gases and solid particles.

A pyroclastic surge contains a lower proportion of gases and more solid particles. (correct)

A pyroclastic surge moves slowly and is confined to flowing downslope.

A pyroclastic surge is not turbulent and moves at the speed of hurricanes.

How do ignimbrites vary in thickness?

From just a few meters to hundreds of meters. (B) Signup and view all the answers

What differentiates a base surge from an ash cloud surge?

A base surge occurs at the base of the eruptive column, while an ash cloud surge occurs within the ash cloud when it is neither rising nor collapsing. (A) Signup and view all the answers

Why are pyroclastic surges considered extremely dangerous?

Because they are turbulent, move at hurricane speeds, and are not confined to flowing over topographic highs. (A) Signup and view all the answers

What do ignimbrites contain a high percentage of?

Pumice and ash (B) Signup and view all the answers

What is the origin of the word 'ignimbrite'?

Latin words igni, meaning fire, and imbri, meaning rain (D) Signup and view all the answers

What makes pyroclastic surges move quickly?

High proportion of gases and fewer solid particles (C) Signup and view all the answers

How do ignimbrites vary in length?

From a few kilometers to tens of kilometers (B) Signup and view all the answers

What characterizes a pyroclastic surge?

Low density flow of gases and other pyroclastic materials (C) Signup and view all the answers

What is the main reason pyroclastic surges are difficult to protect oneself from?

The high speed and turbulence (D) Signup and view all the answers