Step-by-step explanation:
The sediment on the Great Plains does indeed have its origins in the Rocky Mountains. The Rocky Mountains are a major source of sediment that has been transported and deposited over millions of years through various geological processes.
The Rocky Mountains are characterized by rugged terrain and high elevations. Erosional forces, such as weathering, rivers, and glaciers, act on the rocks of the Rockies, breaking them down into sediment. Over time, rivers flowing eastward from the Rocky Mountains have carried this sediment across the Great Plains, depositing it as they flow. This process has contributed to the formation and evolution of the landscape in the Great Plains.
In summary, the sediment found on the Great Plains can be traced back to the erosion and weathering of rocks in the Rocky Mountains, carried eastward by rivers and other geological processes.