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| Igneous rock that formed below earth's surface. |
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| A compositional group of ingneous rocks, indicating that the rock contains at least 25% dark silicate minerals. The other dominat mineral is plagioclase feldspar |
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| A texture of igneous rocks in which the crystals are too small for individual minerals to be distinguished with out the aid of a microscope |
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| In agneous activity, the process of incorperating country rock into a magma body |
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| A compositonal group of igneous rocks indicating that the rock contains substantial dark silicate minerals and calcium-rich plagioclase feldspar |
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| A large mass of igneous rock that formed when magma was emplaved at depth, crystallized, and subsequently exposed by erosion |
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| A concept proposed by N.L. Bowen that illistrates the relationship between magma and the minerals crystallizing from in during the formation of igneous rocks |
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| Consist of a mass of intergrown crystals which are roughly equal in size and large enough so that the individual minerals can be identified without the aid of a microscope |
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| Form as igneous rocks cool and develop shrinkage fractures that produce elongated, pillar-like columns |
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| A term used to discribe intrusive igneous masses that form parallel to the bedding of the surrounding rock |
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| The formation and growth of a crystalline solid from a liquid or gas |
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| During the crystallization of magma, the earlier-formed minerals are denser than the liquid portion and settle to the bottom of the magma chamber |
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| Melting that occurs as rock ascends due to a drop in confining pressure |
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| A tabular-shaped intrustive igneous feature that cuts through the surrounding rocks |
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| Term used used to desribe plutons that cut across existing rock structures, such as bedding planes |
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| Igneous rocks that form when molten rock solidifies at the sruface |
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| Compositional group of igneous rocks indicating that rock is composed almost entirely of light-colored silicates |
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| A texure of igneous rocks in which the crystals are too small for individual minerals to be distinguished without the aid of a microscope |
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| An igneous rock texture resulting from the consolidation of individual rock fragments that are ejected during a violent volcanic eruption |
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| The gradual increase in temperature with depth in the crust. |
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| Natural glass produced when molten lava cools too rapidly to permit recrystallization. Volcanic glass is solid composed of unordered atoms |
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| Texture of certain igneous rocks such as obsidian, that contains no crystals |
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| The matrix of smaller crystals within an igneous rock that has prophyritic texture |
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| A compostional group of igneous rocks indicating the rock is composed almost entirely of light-colored silicated |
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| Rock formed from the crystallization of magma |
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| A compostional group of igneous rocks, indicating that the rock contains at least 25% dark silicate minerals. |
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| A structure that results from the emplacement and crystallization of magma beneath the surface of earth |
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| Massive igneous body intruded between preexisting strata |
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| Magma that reaches earth surface |
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| From magnesium and ferrum, they are typically darker and denser than granitic rocks |
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| A body of molten rock found at depth, including any dissolved gases and crystals |
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| Process of altering the composition of a magma through the mixing of material from another magma body |
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| Process of generating more than one rock type from a single magma |
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| An ingeous pluton that is not tabular in shape |
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| The liquid portion of magma excluding the solid crystals |
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| Process by which most igneous rocks melt |
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| A very coarse-grained ingeous rock commonly found as a dike associated with a large mass of plutonic rock that has smaller crytals |
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| Texture of ingeous rocks in whcih the interlocking crystals are all arger than one centimeter in diameter. |
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| Igneous rock texture in which the crystals are roughly equal in size are large enough so the indivual minerals can be identified without the aid of a microscope |
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| Conspicuously large crystal embedded in a matrix of finer-grained crystals |
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| ignoeus rocks that form at depth |
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| structure that results from the emplacement and crystallization of magma beaneth the earths surface |
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| igneous rock texture characterized by two distinctively different crystal sizes. |
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| igneous rock with a porphyritic texture |
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| igneous rock texture resulting from the consolidation of individual rock fragments that are ejected during an eruption |
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| A tabular igneous body that was intruded parallel to the layering of preexisting rock |
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| A pluton similar to but smaller than a batholith |
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| Describing a feature such as an igneous pluton having two dimensions that are much longer than the third |
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| The size, shape, and distribution of the particals that collectively constitute a rock |
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| A compositional group of igneous rocks containing mostly olivine and pyroxene |
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| Term applied to aphanitic igneous rocks that contain many small cavities called vesicles |
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| Gaseous components of magma dissolved in the melt |
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| Igneous rocks that form when molten rock solidifies at the surface |
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| An inclusion of unmelted country rock in an igneous pluton |
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