Answer:
The given blank can be filled with regional.
Step-by-step explanation:
Regional metamorphism takes place over a much greater region. This metamorphism generates rocks like schist and gneiss. Regional metamorphism is the result of large geographic procedures like mountain building.
These rocks when getting exposed to the surface demonstrate the astounding pressure, which makes the rocks to get dissociated or bent due to the phenomenon of mountain building. The regional metamorphism generally gives rise to foliated rocks like schist and gneiss.