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?

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

What differentiates a base surge from an ash cloud surge?

<p>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)</p> Signup and view all the answers

Why are pyroclastic surges considered extremely dangerous?

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

What do ignimbrites contain a high percentage of?

<p>Pumice and ash (B)</p> Signup and view all the answers

What is the origin of the word 'ignimbrite'?

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

What makes pyroclastic surges move quickly?

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

How do ignimbrites vary in length?

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

What characterizes a pyroclastic surge?

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

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

<p>The high speed and turbulence (D)</p> Signup and view all the answers

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