are flood plains created bye constructive or destructive forces or both

Answer 1

Floodplains are typically created by constructive forces, such as sediment deposition and erosion, that occur over time as a river floods and the water recedes. However, destructive forces, such as flooding and channel avulsion, can also shape and modify floodplains. So, both constructive and destructive forces play a role in the formation and evolution of floodplains.