What are the 3 classifacations of sedimentary rocks?

Answer 1

detritic (sand and pebbles glued together)
chemical (salt in the water)
biochemical (squeletons of aquatic animals)

Answer 2

Clastic: your basic sedimentary rock. Clastic sedimentary rocks are accumulations of clasts: little pieces of broken up rock which have piled up and been "lithified" by compaction and cementation.

Chemical: many of these form when standing water evaporates, leaving dissolved minerals behind. These are very common in arid lands, where seasonal "playa lakes" occur in closed depressions. Thick deposits of salt and gypsum can form due to repeated flooding and evaporation over long periods of time.

Organic: any accumulation of sedimentary debris caused by organic processes. Many animals use calcium for shells, bones, and teeth. These bits of calcium can pile up on the seafloor and accumulate into a thick enough layer to form an "organic" sedimentary rock.

Answer 3

The 3 classifications of sedimentary rocks are clastic (composed of discrete fragments or clasts of materials derived from other rocks, composed largely of quartz); biogenic (composed of materials generated by living organisms and include carbonate materials created by organisms such as corals, molluscs and foraminfera which cover the ocean floor with layers of calcite which later form limestone); and precipitate (formed when mineral solutions such as sea water evaporate)