Metamorphic rocks form when rocks put through to high heat, high pressure, hot mineral-rich fluids or, common conditions like these factors are found deep within the Earth or where tectonic plates meet. 
How are they form
- Metamorphic rocks do not melt. Metamorphic rocks Transform them into murky, more compact rocks. New minerals are created by rearranging of mineral components. Metamorphic rocks are often squished, smeared out, and folded. 
* Metamorphic rocks are formed by the effect of heat and pressure on existing rocks
*This can greatly affect the hardness, texture, or layer patterns of the rocks 
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