Metamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means `change in form`. The original rock (protolith) is subjected to heat (temperatures greater than 150 to 200 °C) and pressure (1500 bars), causing profound physical and/or chemical change. The protolith may be sedimentary rock, ig.....
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igneous or sedimentary rocks that have been altered or recrystallized by extreme heat or pressure.
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any of a class of rocks that result from the alteration of preexisting rocks in response to changing environmental conditions, such as variations in ... [12 related articles]
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Metamorphic rocks are compacted by pressure and heat from deep inside the earth .
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Pressure 'cooked' rocks altered by heat and pressure within the Earth's crust. One of the most common metamorphic rocks in Britain, is Slate
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One of the three classes of rock making up the earth
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A rock that has undergone chemical or structural changes. Heat, pressure, or a chemical reaction may cause such changes.
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a rock derived from preexisting rocks by mineralogical, chemical, and structural alterations caused by processes within the earth's crust. Marble is a metamorphic rock.
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Any rock formed from preexisting rocks within the earth's crust by changes in temperature and pressure and by chemical action of fluids.
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A rock that forms from the recrystallization of igneous, sedimentary or other metamorphic rocks through pressure increase, temperature rise, or chemical alteration.
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http://www.physicalgeography.net/physgeoglos/m.html
Metamorphic rock is rock that has been altered by intense heat, pressure, or both. It may originally have been sedimentary or igneous rock, or even different metamorphic rock. The changes that take place during metamorphism can affect both the structure of the rock and its composition. Very often the rock is re-crystallized. Contact metamorphism is...
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Any rock derived from other rocks by chemical, mineralogical and structural changes resulting from pressure, temperature or shearing stress.
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Rock altered in appearance, density and crystalline structure, and in some cases mineral composition, by high temperature or pressure, or both. Slate is derived from shale; quartzite from quartz sandstone; and true marble from limestone. Gneiss can be derived from both sedimentary, igneous, and pre-existng metamorphic rocks. More on metamorphic roc...
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Any rock derived from other rocks by chemical, mineralogical and structural changes resulting from pressure, temperature or shearing stress.
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http://www.ucmp.berkeley.edu/glossary/gloss2geol.html
Any rock derived from other rocks by chemical, mineralogical and structural changes resulting from pressure, temperature or shearing stress.
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A type of rock that was once very different and has been changed from its original igneous or sedimentary characteristics when a large amount of heat, pressure, or hot mineral-rich fluids (or a combination of the three) have been applied.
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rocks that are changed from sedimentary, igneous or other metamorphic rocks by intense pressure and heat
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rocks that are changed from sedimentary, igneous or other metamorphic rocks by intense pressure and heat
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noun rock altered by pressure and heat
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Rock altered in structure, composition, and texture by pressure or heat after its original formation. (Rock that actually melts under heat is called igneous rock upon cooling.) For example, limestone can be metamorphosed by heat into marble, and shale by pressure into slate. The term was coined in 18...
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a rock derived from a pre-existing rock that has been changed in its minerals, chemistry and structure in response to changes in temperature, pressure and stress.
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They are formed deep beneath the Earth's surface under great stress from high pressures and temperatures. Garnets are a Metamorphic mineral.
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A rock changed from its original form and/or composition by heat, pressure, or chemically active fluids, or some combination of them.
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A 'changed rock', altered by heat and or pressure so that mineral grains are preferentially orientated or new types of crystals begin to grow.
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a rock which has re-crystallised due to heat and/or pressure. Examples
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