Metamorphic rock is the result of the transformation of a pre-existing rock type, the protolith, in a process called metamorphism, which means 'change in form'.
http://en.wikipedia.org/wiki/Metamorphic_rock
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A metamorphic rock is an igneous, sedimentary, or another metamorphic rock that has been: 1) squeezed by incredible pressures deep underground, 2) has been exposed to very hot fluids, or 3) has been exposed to very high temperatures without...
http://wiki.answers.com/Q/What_does_metamorphic_mean
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Metamorphic rocks are rocks that have "morphed" into another kind of rock. These rocks were once igneous or sedimentary rocks. How do sedimentary and igneous rocks change? If you exam metamorphic rock samples closely, you'll discover how flattened some of the grains in the rock are. ... How Metamorphic Rock Is Formed...
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www.fi.edu/fellows/fellow1/rocks/create/metamorph.htm
www.fi.edu/fellows/fellow1/rocks/create/metamorph.htm
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The oldest known rock lies in Canada. The Acasta gneiss, a metamorphic rock, is 3.96 billion years old. ... Metamorphic rocks form deep in the earth where high temperature, great pressure, and chemical reactions cause one type of rock to change into another type of rock. Metamorphic rocks begin to form at 12-16...
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library.thinkquest.org/J002289/meta.html
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K-6 Metamorphic Rock Module. Exercise designed for use by elementary schools, a little rough around the edges. ... Metamorphic Rock Identification; What Lies Beneath? ... Metamorphic Rock Textures...
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geology.csupomona.edu/alert/metamorphic/metarxs.htm
geology.csupomona.edu/alert/metamorphic/metarxs.htm
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The first thing to notice when you look at a metamorphic rock is its texture. Is the rock foliated or not? Foliation refers to flat or wavy planar features (looking like layers) caused by the alignment of platy minerals such as mica.
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geology.csupomona.edu/alert/metamorphic/metaclass.htm
geology.csupomona.edu/alert/metamorphic/metaclass.htm
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The Rock Cycle is a group of changes. Igneous rock can change into sedimentary rock or into metamorphic rock. Sedimentary rock can change into metamorphic rock or into igneous rock. Metamorphic rock can change into igneous or sedimentary rock.
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www.cotf.edu/ete/modules/msese/earthsysflr/rock.html
www.cotf.edu/ete/modules/msese/earthsysflr/rock.html
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A picture gallery of metamorphic rocks by Geology.com ... Metamorphic Rock Types Menu ... Gneiss is foliated metamorphic rock that has a banded appearance and is made up of granular mineral grains. It typically contains abundant quartz or feldspar minerals. The specimen shown above is about two inches (five centimeters) across.
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geology.com/rocks/metamorphic-rocks.shtml
geology.com/rocks/metamorphic-rocks.shtml
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Similarly, if the rock had been injected by dikes or sills prior to metamorphism, these contrasting compositional bands, not necessarily parallel to the original bedding, could be preserved in the metamorphic rock.
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www.tulane.edu/~sanelson/geol212/metatexture.htm
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