What process involves the combination of sediments with chemical agents to form solid rock?

The process involving the combination of sediments with chemical agents to form solid rock is known as lithification. Lithification encompasses various processes including the compaction of sediments under pressure, which reduces pore space, and cementation, where minerals precipitate from water and bind the sediment particles together.

During lithification, sediments can undergo significant transformations, including the introduction of minerals from groundwater that can fill spaces between sediment grains, effectively locking them into a solid rock formation. This is a crucial step in sedimentary rock formation and directly results in the development of sedimentary structures.

Cementation is, indeed, a part of the lithification process, but lithification encompasses more than just cementation; it includes both compaction and chemical reactions. Metamorphosis refers to the change of one rock type into another through heat and pressure, which is a different geological process, while compression alone does not address the chemical interactions involved in solidifying sediments into rock.