Most rocks in course of time become metamorphic or changed forms of rocks.
Under the impact of heat or pressure on sediments or igneous rocks, metamorphic rocks are formed.
Huge pressure and high temperature change the color, rigidity, and composition of all pre-existing rocks.
The rocks formed due to the operation of such processes are defined as the Metamorphic rocks.
Temperature, pressure, stress, and access to chemically reactive substances are the main agents, which are responsible for metamorphism.
Heat causes the minerals to recrystallize in the rock.
Molten magma changes surrounding rocks into metamorphic rocks.
Similarly, the formation of the rocks due to tremendous pressure is known as dynamic or regional metamorphism.
Slate, gneiss, schist, marble, and diamond are good examples of these rocks.
These types of rocks are hard and tough in comparison to the parent rocks from which they are formed.
In India, marble is found in Rajasthan, Bihar and Madhya Pradesh, whereas slates are available in plenty in Orissa, Andhra Pradesh and Haryana.