Question

Alluvial fan in formed

Answer 1

Alluvial fans are usually created as flowing water interacts with mountains, hills, or the steep walls of canyons . 

Answer 2

Alluvial fans exist on other planets....an alluvial fan is triangle -shaped deposit of gravial,sand,and even smaller pieces of sediment such as silt.This ssediment is called alluvium. Alluvial fan are usually created as following water interacts with mountains,hills or steep walls of canyons.