Question

1
ASSIGNMENT - 4
Q.1. (A) Complete the statements choosing correct option from the bracket:
The sediments are deposited at the foothills of the mountains in a triangular area forming an/a
Marks : 20
(a) lime
(a) alluvial fan
(b) yardang
(c) delta
(d) V-shaped valley
The landforms developed in limestone areas are also called as landforms.
(b) sinkhole
(c) krast
(d) coastal
(B) Rewrite the correct statement:
River's work is more prominent in desert regions than other agents of erosion
The work of groundwater is effective in the area with soft roc
Q.2. (A) Give geographical reasons: (AM
Specific landforms are formed
The work of
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Answer 1

Answer:

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Answer 2

Answer:

An alluvial fan is an accumulation of sediments shaped like a section of a shallow cone,[1] with its apex at a point source of sediments, such as a narrow canyon emerging from an escarpment.[2] They are characteristic of mountainous terrain in arid to semiarid climates,[3][4] but are also found in more humid environments subject to intense rainfall[1] and in areas of modern glaciation.[4] They range in area from less than 1 square kilometre (0.39 sq mi)[4][5] to almost 20,000 square kilometres (7,700 sq mi).[6]

Alluvial fans typically form where flow emerges from a confined channel and is free to spread out and infiltrate the surface. This reduces the carrying capacity of the flow and results in deposition of sediments.[1] The flow can take the form of infrequent debris flows or one or more ephemeral or perennial streams.[6]

Alluvial fans are common in the geologic record, such as in the Triassic basins of eastern North America and the New Red Sandstone of south Devon.[7] Such fan deposits likely contain the largest accumulations of gravel in the geologic record.[8]

Some of the largest alluvial fans are found along the Himalaya mountain front on the Indo-Gangetic plain.[6] A shift of the feeder channel (a nodal avulsion) can lead to catastrophic flooding, as occurred on the Kosi River fan in 2008.[9]

Explanation:

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