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SlideshowReport

A Typical aa Flow

Description
Pyroclastic materials
“Fire fragments”
Types of pyroclastic material
Ash and dust – fine, glassy fragments
Pumice – from “frothy” lava
Lapilli – “walnut” size
Cinders – “pea-sized”
Particles larger than lapilli
Blocks – hardened lava
Bombs – ejected as hot lava
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