Answer:
sedimentary rocks typically are classified by grain size and consist of sediment eroded and weather from other rocks
Step-by-step explanation:
The sedimentary rocks are one of the three major groups of rocks. These rocks are the product of the weathering and erosion from the other two types of rocks, the igneous and metamorphic rocks.
As the weathering and erosion influence the igneous and metamorphic rocks, small particles from them get broken apart and removed. Those small particles are known as sediments. The sediments can be of all types of rocks. When the sediments accumulate, and if there are suitable temperatures, pressure, and natural means of attaching them, they will create a new rock, sedimentary rock.
In general, the sedimentary rocks are classified by their grain size, as it is usually the main characteristic that distinguishes them.
Apart from being made out of sediments, these rocks also can contain organic matter.