IGNOU MCH 23 2026 - Metamophic rocks: Igneous and sedimentary rocks that have been altered

Question

Metamophic rocks: Igneous and sedimentary rocks that have been altered from their
previous condition by combined action of heat and pressure below Earth’s surface.

31 Jul 2026

Answer :

Word Count : 609

Metamorphic rocks are rocks that have undergone physical and chemical changes due to the combined effects of high temperature, high pressure, and chemically active fluids beneath the Earth's surface. These rocks are formed when pre-existing igneous or sedimentary rocks are subjected to conditions different from those under which they originally formed. The process of transformation is known as metamorphism. During this process, the mineral composition, texture, and structure of the parent rock change without the rock melting completely. If melting occurs, the rock becomes magma and later forms igneous rocks. Heat is one of the primary agents of metamorphism. The heat required for metamorphism originates from the Earth's internal energy, nearby magma intrusions, or geothermal gradients. Increased temperature causes minerals within the rock to recrystallize, producing new mineral assemblages that are stable under the

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