What is Metamorphic Rocks?

Answer 1

Rocks that have been solid-state changed by pressure and temperature; that means they were not melted, but they still streched, flowed, and changed their minerals while still maintaining its strength as a rock.

Answer 2

Definition Of Metamorphic Rock

Answer 3

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". The protolith is subjected to heat (greater than 150 degrees Celsius) and extreme pressure causing profound physical and/or chemical change. The protolith may be sedimentary rock, igneous rock or another older metamorphic rock.

Metamorphic rocks make up a large part of the Earth's crust and are classified by texture and by chemical and mineral assemblage (metamorphic facies). They are formed deep beneath the Earth's surface by great stresses from rocks above and high pressures and temperatures. They are also formed by the intrusion of molten rock, called magma, into solid rock and form particularly at the place of contact between the magma and solid rock where the temperatures are high.

The study of metamorphic rocks (now exposed at the Earth's surface following erosion and uplift) provides us with very valuable information about the temperatures and pressures that occur at great depths within the Earth's crust.

Some examples of metamorphic rocks are gneiss, slate, marble, and schist.

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Answer 4

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". The protolith is subjected to heat (greater than 150 degrees Celsius) and extreme pressure causing profound physical and/or chemical change. The protolith may be sedimentary rock, igneous rock or another older metamorphic rock.

Metamorphic rocks make up a large part of the Earth's crust and are classified by texture and by chemical and mineral assemblage (metamorphic facies). They are formed deep beneath the Earth's surface by great stresses from rocks above and high pressures and temperatures. They are also formed by the intrusion of molten rock, called magma, into solid rock and form particularly at the place of contact between the magma and solid rock where the temperatures are high.

Answer 5

Metamorphic rocks are rocks that have undergone metamorphism, or "change in form." What this means is that a pre-existing rock type, the protolith, is exposed to heat greater than 150 C. The protolith can be igneous or sedimentary rock, or just some older metamorhpic rock. Metamorphic rock is useful to geologists because it can be used to learn a lot about processes that happen deep within the Earth's crust.

Answer 6

Metamorphic rocks are rocks that have "morphed" into another kind of rock. These rocks were once igneous or sedimentary rocks.

The rocks are under tons and tons of pressure, which fosters heat build up, and this causes them to change. If you exam metamorphic rock samples closely, you'll discover how flattened some of the grains in the rock are

and metamorphism is the process which is responsible for the formation of these rocks..in which the pre-existed rocks are subject to temperature and pressure condition where they change there form but they dont melt ,,,they dont turn in to melt the change occur from solid to solid

Answer 7

Metamorphic rocks are produced when sedimentary or igneous rocks are transformed by heat and/or pressure. The word “metamorphic” comes from the Greek language, which means “to change from.”

Answer 8

They are Igneous or Sedimentary rocks that have been subjected to heat and/or pressure causing the crystaline structures to change. Mineral types will usually segregate into bands, and the mineral crystals will usually grow in size.

Banding and crystal size are the easiest ways to identify a metamorphic rock from an igneous or sedimentary rock....

Answer 9

Metamorphic rocks are sedimentary or igneous rocks that have been altered by heat and/or pressure. As they are derived from previously existing igneous, sedimentary or even metamorphic rock, their appearance is variable. They are identified by the types of minerals they contain and their texture. Thermally metamorphosed rocks occur bordering igneous intrusions, which altered the surrounding rock originally because of their intense hear, resulting also in the formation of new minerals such as andalusite and garnet. Regionally metamorphosed rocks occur in the roots of mountain ranges, where intense pressures and high temperatures formed platy minerals (e.g. mica) and high-pressure minerals (e.g. staurolite).