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Pyroclastic Flow

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Questions and Answers

What is the origin of the term 'ignimbrite'?

From the Latin words for fire and rain (correct)

From the Latin words for hot ash and rock

From the Latin words for volcanic eruption and deposit

From the Latin words for igneous rock and boulder

What characteristic makes pyroclastic surges low density?

Slower movement speed

Flowing downslope

Higher proportion of gases (correct)

Higher proportion of solid particles

How do ignimbrites compare to nuee ardente flows in terms of speed?

Move quicker than nuee ardente flows (correct)

Have equal speed to nuee ardente flows

Move slower than nuee ardente flows

Do not move at all

What is a distinguishing feature of a base surge among pyroclastic surges?

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

What characterizes an ash cloud surge among pyroclastic surges?

Occurs within the ash cloud when it is neither rising nor collapsing Signup and view all the answers

What defines a ground surge among pyroclastic surges?

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

Why are ignimbrites termed as deposits for pumice flows?

Due to containing a high percentage of pumice and ash Signup and view all the answers

What do ignimbrites primarily consist of?

Pumice and ash Signup and view all the answers

How do ignimbrites differ in length?

Several kilometers to tens of kilometers from the initial eruption site Signup and view all the answers

What is the main reason for pyroclastic surges being low density?

Higher proportion of gases Signup and view all the answers

What distinguishes a base surge among pyroclastic surges?

Occurs at the base of the eruptive column as it is collapsing Signup and view all the answers

Why are pyroclastic surges extremely dangerous?

They move quickly and cause massive damage Signup and view all the answers

What is the main characteristic that distinguishes ignimbrites from nuee ardente flows?

Variability in thickness Signup and view all the answers

Which type of pyroclastic surge occurs within the ash cloud when it is neither rising nor collapsing?

Ash Cloud Surge Signup and view all the answers