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- Q512121 subject Q6274804.
- Q512121 subject Q6802033.
- Q512121 subject Q7468490.
- Q512121 subject Q8266666.
- Q512121 abstract "Pyroclastic rocks or pyroclastics (derived from the Greek: πῦρ, meaning fire; and κλαστός, meaning broken) are clastic rocks composed solely or primarily of volcanic materials. Where the volcanic material has been transported and reworked through mechanical action, such as by wind or water, these rocks are termed volcaniclastic. Commonly associated with unsieved volcanic activity—such as Plinian or krakatoan eruption styles, or phreatomagmatic eruptions—pyroclastic deposits are commonly formed from airborne ash, lapilli and bombs or blocks ejected from the volcano itself, mixed in with shattered country rock.Pyroclastic rocks may be a range of clast sizes, from the largest agglomerates, to very fine ashes and tuffs. Pyroclasts of different sizes are classified as volcanic bombs, lapilli, and volcanic ash. Ash is considered to be pyroclastic because it is a fine dust made up of volcanic rock. One of the most spectacular forms of pyroclastic deposit are the ignimbrites, deposits formed by the high-temperature gas-and-ash mix of a pyroclastic flow event.".
- Q512121 thumbnail Pyroclastic_Flow_St._Helens.jpg?width=300.
- Q512121 wikiPageWikiLink Q107099.
- Q512121 wikiPageWikiLink Q116269.
- Q512121 wikiPageWikiLink Q1257738.
- Q512121 wikiPageWikiLink Q1639789.
- Q512121 wikiPageWikiLink Q1758272.
- Q512121 wikiPageWikiLink Q180044.
- Q512121 wikiPageWikiLink Q180621.
- Q512121 wikiPageWikiLink Q188698.
- Q512121 wikiPageWikiLink Q209245.
- Q512121 wikiPageWikiLink Q221616.
- Q512121 wikiPageWikiLink Q2535394.
- Q512121 wikiPageWikiLink Q256438.
- Q512121 wikiPageWikiLink Q40157.
- Q512121 wikiPageWikiLink Q42278.
- Q512121 wikiPageWikiLink Q484924.
- Q512121 wikiPageWikiLink Q491672.
- Q512121 wikiPageWikiLink Q495423.
- Q512121 wikiPageWikiLink Q5177532.
- Q512121 wikiPageWikiLink Q612133.
- Q512121 wikiPageWikiLink Q6274804.
- Q512121 wikiPageWikiLink Q6802033.
- Q512121 wikiPageWikiLink Q7263630.
- Q512121 wikiPageWikiLink Q7468490.
- Q512121 wikiPageWikiLink Q747501.
- Q512121 wikiPageWikiLink Q8072.
- Q512121 wikiPageWikiLink Q82613.
- Q512121 wikiPageWikiLink Q8266666.
- Q512121 comment "Pyroclastic rocks or pyroclastics (derived from the Greek: πῦρ, meaning fire; and κλαστός, meaning broken) are clastic rocks composed solely or primarily of volcanic materials. Where the volcanic material has been transported and reworked through mechanical action, such as by wind or water, these rocks are termed volcaniclastic.".
- Q512121 label "Pyroclastic rock".
- Q512121 depiction Pyroclastic_Flow_St._Helens.jpg.