Changing pressure and temperature can transform sedimentary rock into metamorphic rock.

Here's why:

* Sedimentary rocks are formed from the accumulation and cementation of sediments.

* Metamorphic rocks are formed when existing rocks (including sedimentary rocks) are subjected to intense heat and pressure deep within the Earth's crust. This alters the mineral composition and texture of the original rock, creating a new type of rock.

For example, sandstone (a sedimentary rock) can be transformed into quartzite (a metamorphic rock) under the right conditions of heat and pressure.