magma

ALASKA VOLCANO OBSERVATORY GLOSSARY
Molten rock beneath the Earth's surface.
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GLOSSARY OF VOLCANIC TERMS
A term used to describe subsurface molten rock (Jeanloz, 2000, p. 41). Magmas are generally considered to be silicate melts (Grove, 2000, p. 133; Wallace and Anderson, 2000, p. 149), but may also be composed of carbonatitic liquids (Spera, 2000, p. 171). Magmas are composed of up to three components (liquid, crystalline solids, and gas (or supercritical fluid) bubbles; Grove, 2000, p. 133), and may be fully liquid or partially crystalline. Lavas are magmas that have erupted on to a planet's surface.
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USGS PHOTO GLOSSARY OF VOLCANIC TERMS
Magma is molten or partially molten rock beneath the Earth's surface. When magma erupts onto the surface, it is called lava. Magma typically consists of (1) a liquid portion (often referred to as the melt); (2) a solid portion made of minerals that crystallized directly from the melt; (3) solid rocks incorporated into the magma from along the conduit or reservoir, called xenoliths or inclusions; and (4) dissolved gases.
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Sketch by B. Myers
This sketch shows a classic cartoon view of a magma reservoir beneath a volcano and a conduit leading up to a lava dome at the surface. The arrow indicates direction of magma movement from a deeper source.

Glossary of volcanic terms. - University of Wisconsin Oshkosh. . 2001.

Look at other dictionaries:

  • magma — magma …   Dictionnaire des rimes

  • magma — [ magma ] n. m. • 1694; lat. d o. gr. « résidu » 1 ♦ Chim. vieilli Bouillie épaisse, qui reste après l expression des parties liquides d une substance quelconque. ♢ Par ext. cour. Masse épaisse, de consistance pâteuse. Magma informe. 2 ♦ (1879)… …   Encyclopédie Universelle

  • magmă — MÁGMĂ, magme, s.f. Masă minerală fluidă şi incandescentă din interiorul scoarţei pământului, alcătuită din silicaţi. – Din fr. magma Trimis de baron, 13.09.2007. Sursa: DEX 98  MÁGMĂ s. (geol.) topitură. (magmă vulcanică.) Trimis de siveco,… …   Dicționar Român

  • MAGMA — Расширение .magma Тип формата Метаданные Расширен из YAML MAGMA  открытый формат файлов на основе YAML, предназначенный для описания ссылок на файлы для загрузки по протоколам Gnutella, HTTP, FTP и т. п. Magnet ссылки могут… …   Википедия

  • Magma — Sn glühende, flüssige Masse im Erdinneren per. Wortschatz fach. (20. Jh.) Entlehnung. Übernommen und übertragen aus l. magma Bodensatz der Salbe , dieses aus gr. mágma geknetete Masse, Bodensatz .    Ebenso nndl. magma, ne. magma, nfrz. magma,… …   Etymologisches Wörterbuch der deutschen sprache

  • Magma — Magma  французская рок группа, исполняющая прогрессивный рок, образована барабанщиком с классичес …   Википедия

  • magma — sustantivo masculino 1. (no contable) Masa formada por rocas fundidas de las zonas más profundas de la corteza terrestre: El volcán arrojaba magma a través de su cráter. 2. (no contable) Sustancia viscosa y sin forma: Aquella laguna se había… …   Diccionario Salamanca de la Lengua Española

  • Magma — statusas T sritis ekologija ir aplinkotyra apibrėžtis Išsilydžiusi ugninga masė, susidaranti Žemės plutos gelmėse, prisotinta dujų ir vandens garų. Jai stingstant Žemės plutos gelmėse susidaro magminės, arba erupcinės, uolienos (pvz., granitas).… …   Ekologijos terminų aiškinamasis žodynas

  • Magma — Magma, in der Gesteinskunde, ein Eruptivgestein in jenem breiigen oder zähflüssigen Zustand, welchen es vor seiner Erstarrung während des Empordringens in Spalten (Eruptivgänge) und während des Fließens als Lava besaß. Es besteht aus einem… …   Lexikon der gesamten Technik

  • magma — s.m. [dal lat. magma, gr. mágma impasto , affine a mássō impastare ] (pl. i ). 1. (geol.) [massa incandescente costituita da una miscela di silice, silicati, ossidi e solfuri che, risalendo da zone profonde della litosfera, tende a consolidarsi]… …   Enciclopedia Italiana

  • magma — (n.) mid 15c., dregs, from L. magma dregs of an ointment, from Gk. magma thick unguent, ointment, from root of massein to knead, mold, from PIE *mag to knead (see MACERATE (Cf. macerate)). Geological meaning molten rock is 1859. Related: Magmalic …   Etymology dictionary

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