Complete change of form (as part of natural development)
(प्राकृतिक विकास-प्रक्रिया के अंतर्गत) पूर्ण रूप से आकृति में परिवर्तन; रूपांतरण

Metamorphism
Metamorphism is a process in which rocks undergo changes in their mineral composition and texture due to high temperatures, pressures, or chemically active fluids. This process usually occurs deep within the Earth's crust or mantle.

Types of Metamorphism
- Contact Metamorphism: Occurs when rocks are in contact with magma, leading to changes in their mineralogy and texture.
- Regional Metamorphism: Happens over large areas due to tectonic forces and results in the formation of metamorphic rocks like gneiss and schist.

Factors influencing Metamorphism
- Temperature: Higher temperatures lead to increased chemical reactions and changes in mineral composition.
- Pressure: Intense pressure can cause rocks to recrystallize and form new minerals.
- Fluids: Chemically active fluids can introduce new elements into rocks, altering their composition.

Effects of Metamorphism
- Changes in Mineralogy: Rocks can transform into new minerals under the influence of metamorphism.
- Textural Changes: Metamorphism can lead to the development of foliation or banding in rocks.
- Increased Hardness: Metamorphic rocks are typically harder and more resistant to weathering than their parent rocks.

Examples of Metamorphic Rocks
- Marble: Formed from the metamorphism of limestone or dolomite.
- Quartzite: Resulting from the metamorphism of sandstone.
- Slate: A fine-grained metamorphic rock derived from shale or mudstone.
In conclusion, metamorphism is a crucial geological process that alters the physical and chemical properties of rocks, leading to the formation of various metamorphic rocks with unique characteristics.