Because they form and look like Fans
Alluvial fans
Deposition creates landforms such as alluvial fans and deltas.It can also add soil to a river.Hope this helps.
The mineral deposition in this alluvial fan is very unusual for this part of the continent.
It is a fan-or cone-formed store of silt crossed and developed by streams. In the event that a fan is developed by garbage streams it is appropriately called a flotsam and jetsam cone or colluvial fan. The inflexible hand screen fan, was likewise a profoundly enlivening and coveted article among the higher classes
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Alluvial fans
erosion
No
The River Severn does not have an alluvial fan. Rivers that empty into estuaries do not have alluvial fans.
Alluvial fans
In Death Valley, CA
A bajada is an alluvial plain formed at the base of a mountain by the coalescing of several alluvial fans.
herro
A bajada may be created. A bajada is a broad, gently sloping surface formed by the coalescing of alluvial fans.
Rock types commonly found in alluvial fans include sedimentary rocks like sandstone, shale, and conglomerate, as well as igneous and metamorphic rocks that have eroded and been transported by rivers to the fan. The composition of alluvial fans can vary depending on the source rocks from which the sediments are derived.
alluvial fan occurs when the gradient of a river bed decreases suddenly as when a river emerges from a mountain
Alluvial Fans