metamorphic facies

Metamorphic facies are distinct groups of rocks that form under specific temperature and pressure conditions during the process of metamorphism, where existing rocks change due to heat and pressure. Each facies represents a particular environment, such as deep in the Earth’s crust or near tectonic plate boundaries. By studying these groups, geologists can understand the conditions under which the rocks formed and the geological history of an area. Essentially, metamorphic facies help scientists decode the Earth's changes over time and provide insights into its structure and processes.