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Four panel image showing how the New York City skyline has changed over the last 150 years. Viewpoint is the Eastern side of the Brooklyn Bridge looking towards Lower Manhattan.Graph showing sediment source contributions to the River Aire in Leeds. From largest to smallest, contributions are from grasslands (45%), urban sediment (42%), millstone grit (18%), eroding river banks (15%) and coal measures areas (around 10%).Cycle of fluvial geomorphology in both natural and urban settings. Cycle runs from surface to conditions to processes to adaptation, then back into surface.