why does Alluvial fan format the foothills?
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An alluvial fan is a triangle-shaped deposit of gravel, sand, and even smaller pieces of sediment, such as silt. ... Alluvial fans are usually created as flowing water interacts with mountains, hills, or the steep walls of canyons.
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in the foothills, as slopes become gentle, the load of sediments becomes too heavy to be carried by the river over gentler slopes. Thus, sediments get deposited near the foothills, forming a triangular shape - resembling a manual fan or a hand fan, and this is how alluvial fans are created
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