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pyroclastic
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The answer PYROCLASTIC has 1 possible clue(s) in existing crosswords.
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Definitions of pyroclastic in various dictionaries:
Composed chiefly of rock fragments of volcanic origin.
PYROCLASTIC - Pyroclastic rocks or pyroclastics (derived from the Greek: , meaning fire; and , meaning broken) are clastic rocks composed solely or primarily of vo...
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One type of flow from a volcano |
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Dec 10 2011 The Times - Concise |
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Composed chiefly of rock fragments of volcanic origin. |
consisting of or relating to small pieces of rock from a volcano: |
Relating to, consisting of, or denoting fragments of rock erupted by a volcano. |
Pyroclastic fragments. |
Pyroclastic description |
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Pyroclastic rocks or pyroclastics (derived from the Greek: , meaning fire; and , 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 activitysuch as Plinian or krakatoan eruption styles, or phreatomagmatic eruptionspyroclastic 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- |