The rock that has been buried underground and pressed together is called metamorphic rock.

Here's why:

* Metamorphic means "changed form".

* 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 process changes the rock's mineral composition, texture, and sometimes even its chemical composition.

Examples of metamorphic rocks include:

* Marble (formed from limestone)

* Slate (formed from shale)

* Quartzite (formed from sandstone)

* Gneiss (formed from granite)