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magma |
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magma (măg`mə): see lava lava (lä`və), molten rock that erupts on the earth's surface, either on land or under the ocean, by a volcano or through a fissure. ..... Click the link for more information. . magmaMolten or partially molten rock from which igneous rocks form, usually consisting of silicate liquid. Magma migrates either at depth or to the Earth's surface, where it is ejected as lava. The interactions of several physical properties, including chemical composition, viscosity, content of dissolved gases, and temperature, determine the characteristics of magma. Numerous events that can occur during crystallization influence the resulting rock: separation of early crystals from liquid prevents reaction between them; magma can cool too rapidly for reaction to occur; and loss of volatiles may remove some components from the magma. magma 1. a paste or suspension consisting of a finely divided solid dispersed in a liquid 2. hot molten rock, usually formed in the earth's upper mantle, some of which finds its way into the crust and onto the earth's surface, where it solidifies to form igneous rock magma [′mag·mə] (geology) The molten rock material from which igneous rocks are formed.
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| Such Hadid paintings as The World (89 Degrees) and Grand Buildings are evidence of her 'phantasmagorical observation of a chaotic, disorienting, and magmatic city'. The metals in nickel-copper, chromium and PGE deposits were transported by magmas, and the formation of magmatic deposits thus depends largely on magma history. And since the volcanism probably did not only form water from magmatic volatiles but also released substantial quantities that had already existed beneath the surface, he says, "the results substantiate the growing perception of Mars as a 'wet' planet in the first third of its history. |
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