Here's why:

* Metamorphism is the process of transforming existing rocks (igneous, sedimentary, or even other metamorphic rocks) through intense heat and pressure.

* This process doesn't melt the rock completely, but it does cause changes in its mineral composition, texture, and sometimes even its chemical composition.

* The resulting rock is called a metamorphic rock.

Let me know if you'd like to learn more about metamorphic rocks!