Graded bedding refers to a sedimentary structure where particles are sorted by size, typically found in geological formations. This sorting occurs due to processes like water or wind transport, where larger particles settle first, followed by smaller ones. Graded bedding is often observed in river deltas and underwater landslides. Geologists study graded bedding to understand past environmental conditions and sedimentary processes. The presence of graded bedding can indicate changes in energy levels in the transporting medium, such as water or air. This information helps in reconstructing ancient landscapes and understanding earthquake or flood events.