Alluvial fan

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Alluvial fan.jpg
An alluvial fan is a fan-shaped pile of sediment that forms where a rapidly flowing mountain stream enters a relatively flat valley. As water slows down, it deposits sediment (alluvium) that gradually builds a fan.[1]

References

  1. http://wrgis.wr.usgs.gov/docs/parks/misc/glossaryAtoC.html