Lithification of sand and gravel requires both compaction and ____.
A)aggregation
B)filtration
C)condensation
D)cementation
E)stratification

Question

Quizplus · Accepted Answer

Lithification of sand and gravel requires compaction to reduce the pore space between grains, but cementation is needed to bind the grains together and turn them into solid rock. The cementing material can be minerals (e.g. calcite, silica, iron oxides) that precipitate from groundwater, or clay particles that fill the pore space and stick the grains together. Aggregation, filtration, condensation, and stratification are not necessary for lithification.

Lithification of Sand and Gravel Requires Both Compaction and ____