Where does compaction in the formation of sedimentary rock occur..............?

Compaction in the formation of sedimentary rock occurs primarily in the subsurface, where layers of sediment are buried under the weight of overlying sediments. This process involves the reduction of pore space between sediment grains, resulting in the compression and consolidation of the sediment into solid rock. Compaction can also occur at the surface, through processes such as the drying and settling of loose sediment.