Here's a breakdown of the process:

* Sedimentary Rock: Formed from the accumulation and cementation of sediments (like sand, mud, or shells). Examples include sandstone, limestone, and shale.

* Metamorphism: A process where existing rocks (igneous, sedimentary, or even other metamorphic rocks) are transformed by heat, pressure, and/or chemically active fluids. This happens deep within the Earth's crust or when rocks are exposed to tectonic forces.

* Metamorphic Rock: The new rock formed from this transformation. Examples include marble (from limestone), slate (from shale), and gneiss (from various sedimentary or igneous rocks).

The specific type of metamorphic rock formed depends on:

* The original sedimentary rock: Different sedimentary rocks will transform into different metamorphic rocks.

* The intensity of metamorphism: Higher heat and pressure result in more significant changes and different mineral compositions.

So, while sedimentary rock becomes metamorphic rock after undergoing metamorphism, the specific type of metamorphic rock is determined by the original sedimentary rock and the conditions of the transformation.