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Question
Alluvial fans develop when
Options:
A .  abandoned channels are created when meanders are cut off from the rest of the channel
B .  streams carrying a heavy load reduce their velocity as they emerge from mountainous terrain in a nearly horizontal plain
C .  None
D .  streams carrying a heavy load emerge from plain area to standing water
Answer: Option B
Answer: (b)
Alluvial fans are fan-shaped deposits of water transported material (alluvium). They typically form at the base of topographic features where there is a marked break in slope.
Consequently, alluvial fans tend to be coarse-grained, especially in their mouths. At their edges, however, they can be relatively fine-grained.

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