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  1. Igneous rock is the first kind of rock.
  2. Igneous rock is formed by magma or lava (molten rock) cooling and becoming solid.
  3. Igneous rock is rock formed by the hardening and crystallization of molten material that originates deep within the earth. (Web site)
  4. Igneous rock are classified according to mode of occurrence, texture, mineralogy, chemical composition, and the geometry of the igneous body. (Web site)
  5. Igneous rock (etymology from Latin ignis, fire) is one of the three main rock types (the others being sedimentary and metamorphic rock).


  1. Scoria is a dark-colored, vesicular, extrusive igneous rock. (Web site)
  2. Dacite is an extrusive igneous rock. (Web site)
  3. Obsidian Obsidian is a type of naturally-occurring glass formed as an extrusive igneous rock. (Web site)


  1. Igneous rock originates from the cooling and solidification of molten matter from the earth's interior.
  2. I. Igneous Rock Definition - rocks formed by the cooling and solidification of magma.

Molten Magma

  1. Igneous rock is rock formed by solidification from molten magma. (Web site)

Plutonic Igneous Rock

  1. Granodiorite is a plutonic igneous rock, formed by an intrusion of silica-rich magma, which cools in batholiths or stocks below the Earth's surface. (Web site)
  2. Any plutonic igneous rock with very low silica content.

Fine-Grained Igneous Rock

  1. Aplite, which is a fine-grained igneous rock with the same mineralogical composition as granite, also is mined frequently for its feldspar content. (Web site)
  2. Chiefly British A dark, fine-grained igneous rock; diabase. (Web site)
  3. Basalt - A fine-grained igneous rock of mafic composition. (Web site)


  1. Large accumulations such as this form the igneous rock dunite, or when mixed with pyroxene, peridotite. (Web site)
  2. Peridotite is a dark-colored, coarse-grained igneous rock believed by many scientists to be the primary rock of the exterior of Earth's mantle.
  3. Peridotite is an intrusive igneous rock with an ultrabasic composition.

Coarse-Grained Igneous Rock

  1. Similar to gabbro, norite is a type of coarse-grained igneous rock found on both the moon and the Earth.
  2. Granite is a coarse-grained igneous rock of even texture and light color, composed chiefly of quartz and feldspars. (Web site)
  3. The last sample at this station is pegmatitic granite (Station 3C). A Pegmatite is a very coarse-grained igneous rock, typically granite.


  1. Examples of aphanitic igneous rock include basalt, andesite and rhyolite.

Extrusive Igneous Rock

  1. Basalt (an extrusive igneous rock in this case); light colored tracks show the direction of lava flow.
  2. Extrusive igneous rocks Basalt (an extrusive igneous rock in this case); light colored tracks show the direction of lava flow. (Web site)
  3. An Extrusive igneous rock cools very fast on the surface and is created by lava. (Web site)

Three Types

  1. All three types of rocks may be re-melted; when this happens, a new magma is formed, from which an igneous rock may once again crystallize. (Web site)


  1. Granite is a plutonic igneous rock. (Web site)
  2. The magma that cools while still buried under the cooler earth crust is plutonic igneous rock.
  3. Geology. Irregular dark or light streaks in plutonic igneous rock that differ in composition from the principal mass. (Web site)


  1. The depths of these igneous rock bodies closely corresponds to the depth of the seismic activity.


  1. Encyclopedia For "acid rock" as a geologic term, see Igneous rock.


  1. Dike: A vertical or angled layer of igneous rock that cuts across other rock layers, usually by injection into fractures.


  1. It is observed in some igneous rock s and iron ore deposits as the result of the alteration of ilmenite, perovskite, or titanite.

Important Factor

  1. Crystal shape is also an important factor in the texture of an igneous rock.


  1. Type of igneous rock that is abundant in western North America.
  2. It is primarily important as a rock-forming mineral, however, and is abundant in igneous rock s, pegmatite s, and gneiss es. (Web site)
  3. Abundant and widespread, the intrusive igneous rock may be found in tremendous masses in many mountainous areas. (Web site)


  1. These processes move rock material through the states of metamorphic rock, igneous rock, sedimentary rock, melts and sediment. (Web site)
  2. Uses of the Rock Cycle The rock cycle shows how igneous rock may be eroded and transported as fragments and dissolved sediment.


  1. Usually black or dark green, occurring in igneous rock such as basalt.


  1. Pumice is a light, porous type of pyroclastic igneous rock. (Web site)
  2. List the different igneous rock textures (aphanitic, phaneritic, porphyritic, pegmatitic, vesicular, glass, and pyroclastic) and explain their origins.


  1. This term refers to vesicles (holes, pores, or cavities) within the igneous rock.


  1. After total crystallization of the liquid, a hard, dense igneous rock is the result. (Web site)
  2. A peridotite is a dense, coarse-grained igneous rock, consisting mostly of the minerals olivine and pyroxene. (Web site)
  3. Basalt is an extrusive igneous rock, sometimes porphyritic, and is often both fine-grained and dense. (Web site)


  1. Type of igneous rock composed predominantly of calcium-rich feldspar. (Web site)
  2. Hornblendite - A coarse grained igneous rock composed solely or predominantly of hornblende.
  3. Pyroxenite - Pyroxenite is a type of intrusive igneous rock that is predominantly composed of pyroxenes. (Web site)


  1. An igneous rock, usually a dike or sill, with larger, generally conspicuous, early-formed crystals contained within a matrix of much smaller crystals.
  2. Phenocryst: A conspicuous, usually large, crystal embedded in porphyritic igneous rock.


  1. A type of igneous rock that is formed when molten magma from a volcano hardens. (Web site)


  1. Andesite is a type of igneous rock that is found in most volcanic regions of the world, especially around volcanoes that line the Pacific Basin.
  2. When volcanoes erupt and the liquid rock comes up to the earth's surface, then new igneous rock is made.
  3. Rock that erupted from volcanoes and cooled on the surface is called extrusive igneous rock.


  1. Granite is an igneous rock, because it formed as melted rock cooled and hardened.
  2. Granite is a very common igneous rock, which means it formed from other melted rock that cooled and hardened slowly below the earth's surface. (Web site)


  1. Basalt is an extrusive, mafic (contains a high amount of magnesium and iron) igneous rock.
  2. Water draining from igneous rock will contain most of the common metals, such as magnesium, calcium, sodium and potassium, but usually only in small amounts.
  3. Basalt is an extrusive igneous rock that is low in silica content, dark in color, and comparatively rich in iron and magnesium.


  1. Dark igneous rock that is low in silica content and comparatively rich in iron and magnesium.
  2. Description A fine grained (aphanitic) igneous rock, medium to dark in color. (Web site)
  3. Gabbro is a dark, coarse-grained, intrusive igneous rock chemically equivalent to basalt because it shares a common origin, magma, with basalt. (Web site)


  1. Obsidian is an example of another extrusive igneous rock that cooled so fast that it has no crystals and looks like shiny, black glass. (Web site)


  1. Amygdule refers to a mineral containing cavity in an igneous rock formed by escaping gas. (Web site)


  1. Aggregates are made from either crushed rock (limestone, dolomite, quartzite, sandstone, igneous rock and some others) or sand and gravel.


  1. Almost all the road cuts in San Francisco: sandstone, shale, chert, dark igneous rock, serpentine date to the Jurassic.


  1. The rock here is mostly peridotite, a coarse grained igneous rock, kept from melting by extremely high lithostatic pressures. (Web site)
  2. So even beginning with a shale, and metamorphosing and melting it completely we get a felsic igneous rock.


  1. An igneous rock such as basalt may break down and dissolve when exposed to the atmosphere, or melt as it is subducted under a continent.

Sedimentary Rock

  1. The protolith may be sedimentary rock, igneous rock or another older metamorphic rock. (Web site)
  2. The protolith might be an igneous rock, a sedimentary rock, or another metamorphic rock.
  3. A mass of igneous rock intruded between layers of sedimentary rock, resulting in uplift. (Web site)


  1. It is made of igneous rock and formed at mid-ocean ridges, the largest volcanic system on our planet, from melting in the mantle.
  2. Magma from the mantle entered the space that separated the two sides, forming igneous rock that, with sediments, filled the widening gap.

Continental Crust

  1. The continental crust consists of lower density material such as the igneous rock s granite and andesite. (Web site)


  1. Granite is a plutonic igneous rock containing a high proportion of silica.


  1. Granite - A coarse-grained intrusive igneous rock consisting of quartz, feldspar and mica.
  2. Granite - A granular igneous rock composed essentially of quartz, feldspar, and mica.


  1. Domed strata above a laccolith may be exposed at the surface before erosion cuts down far enough to expose the igneous rock.


  1. Rocks which are now on top are exposed to erosion and weathering and are strewn loosely over the igneous rock.
  2. Granite, for example, is a type of igneous rock that commonly breaks down in weathering to produce sand grains that later make up sandstone.
  3. Residual flake vermiculite originated from the iron-rich mineral biotite in igneous rock, then processes of alteration and weathering created vermiculite.


  1. Intrusion: A igneous rock body that formed from magma that forced its way into, through or between subsurface rock units. (Web site)
  2. Intrusion of crystalline igneous rock and regional uplift along the axis of the trough generally complete the history of a particular geosyncline.
  3. Intrusion: An igneous rock body that has forced its way in a molten state into surrounding country rock.


  1. By contrast, geologists often refer to igneous rock with amphibole as hornblendite.
  2. Geologists classify granite as an igneous rock.


  1. Geology. Of or relating to igneous rock that is forced while molten into cracks or between other layers of rock. (Web site)
  2. In geology, any igneous rock dominated by the silicates pyroxene, amphibole, olivine, and mica.
  3. In geology a cumulate is an igneous rock formed by the accumulation of crystals from a magma. (Web site)


  1. Syenite is a type of intrusive igneous rock that is similar in appearance and composition as granite. (Web site)
  2. An igneous rock, usually irregular in texture and composition.
  3. Its composition is thought to be similar to peridotite, an igneous rock of mostly magnesium-rich silicate. (Web site)


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Related Keywords

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  Originally created: August 01, 2010.
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