endogenic processes leads to the formation of metamorphic rocks

Endogenic processes, also known as tectonic or geologic processes, occur within the Earth and lead to the formation of metamorphic rocks through a process called metamorphism. Here are the steps:

1. Burial and Increase in Pressure: When sedimentary or igneous rocks are buried deep within the Earth's crust, they are subjected to immense pressure. This pressure is due to the weight of the overlying rocks and sediment.

2. Increase in Temperature: Along with pressure, the temperature also increases with depth. This is due to the geothermal gradient, which is the rate of increasing temperature with respect to increasing depth in the Earth's interior.

3. Metamorphism: The combination of high temperature and pressure causes the original rock, or parent rock, to undergo physical and chemical changes. This process is known as metamorphism. During metamorphism, the rock remains solid and does not melt, but the minerals within the rock recrystallize and align themselves perpendicular to the direction of pressure.

4. Formation of Metamorphic Rock: The end result of metamorphism is a metamorphic rock. The original rock transforms into a denser, more compact rock with a different mineral composition and often a layered or banded appearance. Examples of metamorphic rocks include slate, schist, and gneiss.

5. Uplift and Erosion: Over time, tectonic forces can cause these metamorphic rocks to be uplifted to the Earth's surface. Once at the surface, they are subjected to exogenic processes like weathering and erosion, which can expose the metamorphic rocks at the Earth's surface.

So, endogenic processes, specifically the increase in pressure and temperature associated with deep burial, lead to the formation of metamorphic rocks.