Here's why:

* Metamorphism is the process where existing rocks (igneous, sedimentary, or even other metamorphic rocks) are transformed by intense heat and pressure.

* This heat and pressure can come from various sources, like tectonic plate collisions, volcanic activity, or burial deep within the Earth.

* The original rock's mineral composition and texture change, creating a new rock with different characteristics.

Examples of metamorphic rocks include:

* Marble (from limestone)

* Slate (from shale)

* Gneiss (from granite or other igneous rocks)

* Quartzite (from sandstone)

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