What type of rocks are formed from accumulation of small pieces of broken-off pre-existing rocks?

Sedimentary rocks are formed through the accumulation and compaction of sediments, which often consist of small pieces of broken-off pre-existing rocks. This process occurs over time as sediments are deposited in layers, typically in environments such as riverbeds, lakes, or ocean floors. The weight of the layers above compresses the sediments beneath, and eventually, they solidify into rock.

In addition to fragments of other rocks, sedimentary rocks can also be formed from organic materials and chemical processes, but the key feature is their origin from the accumulation of sediments. This distinguishes them from metamorphic rocks, which are formed from existing rocks undergoing changes due to heat and pressure, and igneous rocks, which originate from cooled and solidified magma or lava. Chemical rocks, on the other hand, are specifically formed from the precipitation of minerals from solution, not from the aggregation of rock fragments.