Question

18. Describe cementation
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Answer 1

Depends on what you are looking for

Cementation is the binding together of particles or other things by cement.

Cementation, in geology, is hardening and welding of clastic sediments (those formed from preexisting rock fragments) by the precipitation of mineral matter in the pore spaces. It is the last stage in the formation of a sedimentary rock.

Answer 2

Cementation is a type of precipitation, a heterogeneous process in which ions are reduced to zero valence at a solid metallic interface. ... Cementation of copper is a common example. Copper ions in solution, often from an ore leaching process, are precipitated out of solution in the presence of solid iron.

Wikipedia