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A metamorphic rock is a type of rock which has been changed by extreme heat and pressure. Its name is from 'morph' (meaning form), and 'meta' (meaning change). The original rock gets heated (temperatures greater than 150 to 200 °C) and pressured (1500 bars). This causes profound physical and/or chemical change.

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Subduction: Definition & Process. Subduction Is a geological term for one of Earth's tectonic plates sinking under another. When this happens, we can get earthquakes, volcanoes, and a recycling of Earth's rocks.

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The rock cycle is a basic concept in geology that describes the time-consuming transitions through geologic time among the three main rock types:sedimentary, metamorphic, and igneous.

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Deposition is the laying down of sediment carried by wind, water, or ice. Sediment can be transported as pebbles, sand & mud, or as salts dissolved in water. Salts may later be deposited by organic activity (e.g. as sea-shells) or by evaporation.

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the process of eroding or being eroded by wind, water, or other natural agents.

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wear away or change the appearance or texture of (something) by long exposure to the air.

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Crystallization is also a chemical solid–liquid separation technique, in which mass transfer of a solute from the liquid solution to a pure solid crystalline phase occurs. In chemical engineering, crystallization occurs in a crystallizer.

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volcanic activity or phenomena.

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Molten rock usually located deep within the mantle of the Earth that occasionally comes to the surface through cracks in the mantle or through the eruption of volcanoes. Note: When magma cools and solidifies, it forms igneous rock, of which lava is one type.

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This process is called compaction. At the same time the particles of sediment begin to stick to each other - they are cemented together by clay, or by minerals like silica or calcite. After compaction and cementation the sedimentary sequence has changed into a sedimentary rock.

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Lithification (from the Ancient Greek word lithosmeaning 'rock' and the Latin-derived suffix -ific) is the process in which sediments compact under pressure, expel connate fluids, and gradually become solid rock. Essentially, lithification is a process of porosity destruction through compaction and cementation.

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Rock that has formed through the deposition and solidification of sediment, especially sediment transported by water (rivers, lakes, and oceans), ice ( glaciers ), and wind. Sedimentary rocks are often deposited in layers, and frequently contain fossils. Note : Limestone and shale are common sedimentary rocks.