The Rock Cycle:
* Metamorphic rocks are formed when existing rocks (igneous, sedimentary, or even other metamorphic rocks) are subjected to intense heat and pressure deep within the Earth's crust. This changes their mineral composition and texture.
* Sediment is formed by the weathering and erosion of existing rocks, whether igneous, sedimentary, or metamorphic.
The Transformation:
1. Weathering and Erosion: Metamorphic rocks exposed at the Earth's surface are subjected to the forces of weathering (breakdown due to wind, water, ice, or chemical reactions) and erosion (the transportation of weathered material).
2. Transport: The broken-down fragments of the metamorphic rock are transported by wind, water, or ice. During this transport, the fragments are further broken down into smaller pieces.
3. Deposition: Eventually, the transported fragments settle in a new location, often in layers, forming sediment.
Key Points:
* Metamorphic rocks are not a direct source of sediment. They must first be broken down through weathering and erosion.
* The sediment that forms from a metamorphic rock will not retain the original metamorphic characteristics. It will become a new sediment, potentially forming a new sedimentary rock later in the rock cycle.
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