The gently sloping accumulation of coarse alluvium deposits by a braid

The gently sloping accumulation of coarse alluvium deposits by a braided stream is known as

sand bar

alluvial fan

bajada

diaras

Answer is Right!

Answer is Wrong!

This question was previously asked in

UPSC CAPF – 2019

Download PDF Attempt Online

The correct answer is B) alluvial fan. A gently sloping accumulation of coarse alluvium deposited by a stream, especially where it exits a confined area (like a mountain valley) onto a flatter plain, is known as an alluvial fan. Braided streams, due to their high sediment load and variable discharge, are commonly associated with the formation of alluvial fans, particularly in arid or semi-arid environments or areas with high sediment supply.

– Alluvial fans are triangular or cone-shaped depositional landforms created by streams.
– They form where a stream undergoes a decrease in gradient and/or velocity, leading to the deposition of its sediment load.
– Braided streams are often the type of channel found on the surface of alluvial fans, as they are effective transporters and depositors of coarse sediment.
– The deposits typically consist of sand, gravel, and larger clasts (coarse alluvium).

While a braided stream can deposit material in other forms (like sandbars within channels or extensive alluvial plains), the description “gently sloping accumulation” points towards a large, widespread landform, and among the given options, ‘alluvial fan’ best fits the description of a significant depositional feature composed of coarse alluvium deposited by a stream, often braided, losing energy.

Join Our Telegram Channel

More similar MCQ questions for Exam preparation:-