Question

two reason for formation of metamorphic rock

Answer 1

1) Pressure : A phenomenon called ‘burial pressure’ causes metamorphic rock to form.
2) Heat : Deep within the earth where temperature rises, regional metamorphism occur.
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Answer 2

metamorphic rocks are originating at or near the earth surface a sentence subjected to tremendous heat and pressure .this can change the original characteristics of rocks such as their colour, hardness, texture and mineral composition change rocks are called the metamorphic rocks .The Rocks formed by the process of metamorphism during the process of metamorphism the form and composition of a rock may change but there is no disintegration and decomposition of Rock .

metamorphic rocks are formed by the two processes known as thermal metamorphism and dynamic metamorphism

1 in the case of thermal metamorphism the parent rocks under the influence of high temperatures prevailing in the earth crust. for example,limestone is converted into marble shale into Slate and coal into graphite.

2 in the case of dynamic metamorphism the original rocks are changed under the influence of pressure at great depth inside the earth crust. for example, granite is converted into gneiss and shale into schist.