Extrusive Rocks

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The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Extrusive Rocks

 

(or effusive rocks), igneous rocks which, like modern lavas, poured out onto the surface of the earth through volcanic vents or cracks in the earth’s crust and solidified in the form of flows, sheets, and domes.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Although the same extrusive force was applied in both cases, the same amount of extrusion was achieved in different times because some factors such as the age of the patients, form of the teeth, and root surface area affect treatment outcomes.
In contrast to the findings of the present study, an LDF study by Strobl H et al.16 found the PBF of mature teeth with extrusive luxations to remain significantly lower than control teeth throughout the course of follow-up (from splint-removal to 36 weeks following splint removal) and to show no significant improvements over time, a possible indication of pulpal necrosis.
Melsen, "Tissue reaction following application of extrusive and intrusive forces to teeth in adult monkeys," American Journal of Orthodontics, vol.
The soil was classified as Humic Cambisol (Soil Survey Staff, 1999), with A horizon from 0-30 cm and incipient B horizon from 60-80 cm, derived from acidic extrusive rock.
The body of water is nestled between two small hills of luvisol soil and extrusive igneous rocks (andesite-intermediate volcanic breccia) and sediment (sandstone and shale) of the Lower Cretaceous and Eocene-Miocene era (INEGI, 2008).
The O'Neill age class, defined by Moore and Wolfe (1987) as extrusive rocks of the Holocene and youngest Pleistocene, encompasses sites from 1,000 to 150,000 years old.
We are volcanic, creating extrusive and intrusive formations that break the logic of superposition and burst the relation between space and time in the stone book [...
described its resemblance to the extrusive forms of igneous rock as a useful sign in distigushing the hypertrophic subtype from other differential diagnoses [28].
Igneous rocks of a carbonate composition do occur rarely, typically as intrusive or extrusive carbonatite.
The Group B consists of dolerite, basalt and rhyolite samples, which are fine grained or cryptocrystalline extrusive igneous rocks.
Aedeagus large, conspicuous, extrusive, flat, with recurved apex and sharp, subapical flanges.