What is the term applied to rocks changed by heat and pressure?

When rocks are subjected to intense heat and pressure, they undergo a process called metamorphism. Metamorphic rocks are formed when existing rocks are altered physically and chemically due to these extreme conditions.

During metamorphism, the minerals within the rocks recrystallize and reorganize, resulting in the formation of new minerals and textures. This process can occur deep within the Earth's crust or even at the Earth's surface, depending on the level of heat and pressure involved.

Metamorphic rocks can be classified into two main categories: foliated and non-foliated. Foliated metamorphic rocks, such as slate, schist, and gneiss, have a layered or banded appearance due to the alignment of minerals. Non-foliated metamorphic rocks, such as marble and quartzite, lack this layered structure and instead have a more uniform composition.

Metamorphic rocks are commonly found in regions where tectonic plates collide or where volcanic activity is present. These rocks can provide valuable insights into the geological history of an area and the processes that have shaped the Earth over millions of years.

If you are interested in learning more about metamorphic rocks and the processes involved in their formation, you can visit the following websites for additional information:

• Geology.com - Metamorphic Rocks
• Encyclopedia Britannica - Metamorphic Rock

Understanding metamorphic rocks and the forces that shape them is essential for geologists and scientists studying the Earth's history and processes. By exploring the world of metamorphism, we can gain a deeper appreciation for the dynamic nature of our planet and the incredible forces at work beneath our feet.

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