- pyroclastic rocks
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пирокластические породы
English-Russian dictionary of geology. 2011.
pyroclastic rocks
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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 flow — Pyroclastic flows sweep down the flanks of Mayon Volcano, Philippines, in 1984 … Wikipedia
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 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 flow — noun /ˈpaɪ.ɹə.klæst.ɪk ˌfləʊ/ A flow of volcanic ash, dust, rocks and debris that cascades down the slope of a volcano during an eruption. Pyroclastic flows are very dangerous, reaching speeds greater than 60 miles per hour and temperatures in… … Wiktionary
pyroclastic — /puy reuh klas tik/, adj. Geol. composed chiefly of fragments of volcanic origin, as agglomerate, tuff, and certain other rocks; volcaniclastic. [1885 90; PYRO + CLASTIC] * * * … Universalium
pyroclastic cloud — the cloud of gas, ash, dust, stones and rocks emitted during a highly explosive volcanic eruption … Geography glossary
pyroclastic — /paɪroʊˈklæstɪk/ (say puyroh klastik) adjective composed chiefly of fragments of volcanic origin, as agglomerate, tuff, and certain other rocks …
pyroclastic — adj. (of rocks etc.) formed as the result of a volcanic eruption. Derivatives: pyroclast n … Useful english dictionary
Case hardening of rocks — Case hardening is a weathering phenomenon of rock surface induratoin. It is observed commonly in: felsic alkaline rocks, such as nepheline syenite, phonolite and trachyte; pyroclastic rocks, as pyroclastic flow deposit, fine air fall deposits and … Wikipedia
igneous rock — Any of various crystalline or glassy, noncrystalline rocks formed by the cooling and solidification of molten earth material (magma). Igneous rocks comprise one of the three principal classes of rocks, the others being metamorphic and sedimentary … Universalium
