What is a metamorphic rocks ?
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Metamorphic rocks are rocks which are subjected to high heat, high pressure, hot mineral-rich fluids or, more commonly, some combination of these factors. Its name is from 'morph' (meaning form), and 'meta' (meaning change). The original rock gets heated (temperatures greater than 150 to 200 °C) and pressured (1500 bars). This causes profound physical and/or chemical change. They are not made from molten rock – rocks that do melt form igneous rocks instead. Earth movements can cause rocks to be deeply buried or squeezed. As a result, the rocks are heated and put under great pressure. Examples of metamorphic rocks are anthracite, quartzite, marble, slate, etc.
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