- rock mass, volcanic
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толща вулканических пород
English-Russian dictionary of geology. 2011.
rock mass, volcanic
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Volcanic rock — is an igneous rock of volcanic origin. Texture Volcanic rocks are usually fine grained or aphanitic to glassy in texture. They often contain clasts of other rocks and phenocrysts. Phenocrysts are crystals that are larger than the matrix and are… … Wikipedia
Rock microstructure — includes the texture of a rock and the small scale rock structures. The words texture and microstructure are interchangeable, with the latter preferred in modern geological literature. However, texture is still acceptable because it is a useful… … Wikipedia
Volcanic gas — Volcanic gases include a variety of substances given off by active (or, at times, by dormant) volcanoes. These include gases trapped in cavities (vesicles) in volcanic rocks, dissolved or dissociated gases in magma and lava, or gases emanating… … Wikipedia
Rock cycle — rocks do not remain in equilibrium and are forced to change as they encounter new environments. The rock cycle is an illustration that explains how the 3 rock types are related to each other and how processes change from one type to another over… … Wikipedia
mass movement — an organized effort by a large number of people, esp. those not forming part of the elite of a given society, to bring about pervasive changes in existing social, economic, or political institutions, frequently characterized by charismatic… … Universalium
volcanic glass — a natural glass produced when molten lava cools very rapidly; obsidian. [1830 40] * * * Any glassy rock formed from lava or magma that has a chemical composition close to that of granite. Such molten material may reach very low temperatures… … Universalium
rock — I (New American Roget s College Thesaurus) v. i. swing, sway, oscillate, teeter. See oscillation. n. crag, boulder, cliff, stone; refuge, haven, support, defense; slang, diamond, jewel, gem. See land, stability. II (Roget s IV) n. 1. [A… … English dictionary for students
volcanic dome — ▪ geology also called Lava Dome, any steep sided mound that is formed when lava reaching the Earth s surface is so viscous that it cannot flow away readily and accumulates around the vent. Sometimes domes are produced by repeated outpourings… … Universalium
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
Clastic rock — A thin section of a clast (sand grain), derived from a basalt score. Vesicles (air bubbles) can be seen throughout the clast. Plane light above, cross polarized light below. Scale box is 0.25 mm Clastic rocks are composed of fragments, or clasts … Wikipedia
sedimentary rock — Rock formed at or near the Earth s surface by the accumulation and lithification of fragments of preexisting rocks or by precipitation from solution at normal surface temperatures. Sedimentary rocks can be formed only where sediments are… … Universalium
