pyroclastic
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pyroclastic — [pī΄rə klas′tik] adj. [ PYRO + CLASTIC] of or having to do with rocks formed from material that was explosively ejected from a volcano … English World dictionary
pyroclastic — ALASKA VOLCANO OBSERVATORY GLOSSARY Pertaining to fragmented (clastic) rock material formed by a volcanic explosion or ejection from a volcanic vent. GLOSSARY OF VOLCANIC TERMS Refers to processes resulting from the explosive fragmentation of a… … Glossary of volcanic terms
Pyroclastic flow — Pyroclastic flows sweep down the flanks of Mayon Volcano, Philippines, in 1984 … Wikipedia
Pyroclastic rock — 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… … Wikipedia
pyroclastic Geology — [ˌpʌɪrə(ʊ) klastɪk] adjective of or denoting rock fragments or ash erupted by a volcano, especially as a hot, dense, destructive flow. noun (pyroclastics) pyroclastic material. Derivatives pyroclast noun … English new terms dictionary
pyroclastic flow — ▪ volcanism in a volcanic eruption, a fluidized mixture of hot rock fragments, hot gases, and entrapped air that moves at high speed in thick, gray to black, turbulent clouds that hug the ground. The temperature of the volcanic gases can… … Universalium
Pyroclastic fall — A pyroclastic fall is a uniform deposit of material which has been ejected from an eruption or plume such as an ash fall or tuff. Pyroclastic flows occur relatively spontaneously in the geological time scale and are great indicators of time.… … Wikipedia
Pyroclastic surge — A pyroclastic surge is a fluidized mass of turbulent gas and rock fragments which is ejected during some volcanic eruptions. It is similar to a pyroclastic flow but contains a much higher proportion of gas to rock, which makes it more turbulent… … Wikipedia
pyroclastic flow — ALASKA VOLCANO OBSERVATORY GLOSSARY A dense, hot, chaotic avalanche of rock fragments, gas, and ash that travels rapidly away from an explosive eruption column, down the flanks of the volcano (synonymous with ash flow ). Pyroclastic flows move at … Glossary of volcanic terms
Pyroclastic shield — In volcanology, a pyroclastic shield or terrestrial ignimbrite shield is an uncommon type of shield volcano. Unlike most shield volcanoes, pyroclastic shields are formed mostly of pyroclastic and highly explosive eruptions rather than relatively… … Wikipedia
