Skeleton fragments from siliceous organisms are subject to recrystallization and cementation. Bonding agents can be applied to dentine before cementation of inlays and onlays. Essentially, lithification is a process of porosity destruction through compaction and cementation. Porosity is controlled by&colon; rock type, pore distribution, cementation, diagenetic history and composition. They were created by early cementation of sand and silt by calcite. They formed by the early cementation of sand by calcite. Precipitating minerals reduce the pore space in a rock, a process called cementation. This is similar to the salt cementation process but creates sulfides instead of chlorides. Unlike cementation of definitive crowns, temporary crowns should be relatively easy to remove. Others have shallow rooting zones and poor drainage due to subsoil cementation. These fluids likely also contributed to the cementation of the sediments. The extent of cementation is dependent on the composition of the sediment. The final recovery step may involve precipitation, cementation, or an electrometallurgical process. This mode of failure was determined experimentally to account for effects of particle cementation. The raw material for this was blister steel, made by the cementation process.