Which process is most directly involved in lithification besides compaction?

Which process is most directly involved in lithification besides compaction?

• A. Cementation
• B. Weathering
• C. Erosion
• D. Metamorphism

Answer: (A)

Turning loose sediment into solid rock mainly happens through lithification, which combines two steps: compaction and cementation. After sediments are deposited, weight from overlying material squeezes the grains together and reduces the pore spaces, a process called compaction. The remaining crucial step is cementation, where dissolved minerals precipitate from groundwater and fill the gaps between grains, effectively gluing the particles together to form solid rock. This cementation is the direct action that completes lithification aside from the initial compaction. Other processes listed aren’t part of lithification itself. Weathering and erosion create and move sediment, not the binding of the grains into rock. Metamorphism alters existing rocks through heat and pressure, changing minerals and structure rather than cementing loose grains into sedimentary rock.

Turning loose sediment into solid rock mainly happens through lithification, which combines two steps: compaction and cementation. After sediments are deposited, weight from overlying material squeezes the grains together and reduces the pore spaces, a process called compaction. The remaining crucial step is cementation, where dissolved minerals precipitate from groundwater and fill the gaps between grains, effectively gluing the particles together to form solid rock. This cementation is the direct action that completes lithification aside from the initial compaction.

Other processes listed aren’t part of lithification itself. Weathering and erosion create and move sediment, not the binding of the grains into rock. Metamorphism alters existing rocks through heat and pressure, changing minerals and structure rather than cementing loose grains into sedimentary rock.