metamorphic rock
rock formed from heat and pressure changing the composition of rocks
Metamorphic rock is a type of rock that forms from the transformation of existing rock types, due to changes in temperature, pressure, and chemical environment. This process is called metamorphism, which can occur when rocks are buried deep underground, or when they come into contact with hot fluids.
Metamorphic rocks can form from any type of pre-existing rock, including sedimentary, igneous, and other metamorphic rocks. The resulting metamorphic rock is often different in appearance, texture, and mineral composition from the original rock.
Examples of metamorphic rocks include marble, which is formed from limestone through the process of recrystallization, and slate, which is formed from mudstone or shale through compaction and recrystallization. Other types of metamorphic rocks include gneiss, schist, and quartzite.
The study of metamorphic rocks is important in understanding the evolution of the Earth’s crust, and in identifying natural resources such as metals and minerals, which often occur in association with metamorphic rocks.
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