What Are Metamorphic Rocks?

Metamorphic rocks are rocks that have changed or been changed by heat, pressure or the movement of tectonic plates. They are formed by a process known as metamorphism. In this article, learn more about what is a metamorphic rock, how they are formed, and their different types of classification.

What are Metamorphic Rocks?

Metamorphic rocks are rocks that have been changed by heat, pressure, and/or chemical reactions. They can be formed from a variety of rocks, but the most common type is slate. Slate is made up of small pieces of rock that have been turned into one another.

Types

Metamorphic rocks are rocks that have been changed by heat, pressure, and minerals. The most common type of metamorphic rock is called sedimentary rock. Sedimentary rocks are made up of tiny pieces of other rocks that have been crushed together and sifted through a screen. This process leaves the tiny rocks in one piece and makes them into sedimentary rocks. Sedimentary rocks can be made of anything from clay to sandstone. Metamorphic rocks are made of different types of minerals. Some of the most common types of metamorphic rocks are called igneous rocks. Igneous rocks are made from molten rock (volcanic ash, magma, lava). When the molten rock cools, it turns into stone.

Igneous rocks can be made of any type of mineral, but the most common are called igneous stones. Igneous stones can be very soft or hard, depending on how much heat they were exposed to when they were formed. Metamorphic rocks can also be made from other types of materials, like coal or oil shale.

Definition of Metamorphism

Metamorphism is the process of physical change that occurs to a solid or liquid body, such as rock, in response to heat, pressure, or a chemical agent. The term can also refer to the resulting rock or minerals. Metamorphism is a kind of mineralogical transformation.
The prefix met- refers to the Greek word meaning “change” or “transform.” The suffix -morphy means “of, pertaining to, or relating to a mode of change.”
The three main types of metamorphism are thermal metamorphism, pressure metamorphism, and hydrothermal metamorphism. Thermal metamorphism occurs at temperatures above the melting point of the mineral and results in changes in temperature and pressure that cause the crystal structure of the mineral to break down. Pressure metamorphism results from high pressures and takes place below the surface of the earth. Hydrothermal metamorphism takes place underwater and results in changes in water chemistry that cause minerals to form new compositions.

How Metamorphism Works

The Earth’s surface is constantly changing. The solid rock underneath our feet slowly becomes liquid and then gas, thanks to the heat of the Earth’s mantle. This process is called metamorphism.

Metamorphism happens when rocks are subjected to high temperatures and pressures. The pressure and heat cause the atoms and molecules in the rock to rearrange, which makes it different from its original form. Some of the most common types of metamorphism are:

-Silicate minerals change into quartz, feldspar, and other minerals that are less dense.
-Tectonic plates move, which can cause mountains to form when two different kinds of rock collide.
-Water seeps underground, which can cause mudstones, sandstones, and limestone to form.

Rock Exhibits and Examples

What are metamorphic rocks? Metamorphic rocks are rocks that have been changed by heat, pressure, and/or chemicals. This change can make the rock from one type of mineral to another type of mineral. The most common metamorphic rocks are limestone, slate, and marble.

The KIA Classification System

What Are Metamorphic Rocks?

Metamorphic rocks are a type of sedimentary rock that have been altered by heat, pressure, and/or chemical interactions. This can cause the rock to change its shape, color, and even its mineralogy. The most common metamorphic rocks are those that have been subjected to high temperatures (above 600 degrees Fahrenheit/315 degrees Celsius) and pressures (greater than 10,000 pounds per square inch/2,000 bars).

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