Why does sedimentary rock buried into metamorphic?

Sedimentary rock is buried into metamorphic rock primarily due to tectonic processes, such as subduction, continental collision, or sediment compaction. As sedimentary layers accumulate over time, they can be subjected to increased pressure and temperature conditions deep within the Earth's crust. This environment triggers metamorphism, where the original sedimentary rock undergoes physical and chemical changes, resulting in the formation of metamorphic rock. The transformation often alters the texture, mineral composition, and structure of the rock.