B. Settling from suspension. Dune is larger than a ripple and may be up to several meters high. How running water erodes rock A. Slow abrasion of bottom by sand and pebble load. Erosion most rapid over horizontal layered beds with more resistant rock overlying softer rocks. Stream valleys, channels and floodplanes A. Valleys and floodplains.
Most rivers have sections with each pattern.
Landforms near places of sudden change in velocity. Decrease in slope towards evolving delta can lead to a pattern of distributories. Where waves and tides are strong, deltas cannot form, as along east coast of North America.