Which among the following are depositional landforms?
(A) Alluvial Fans
(B) River terraces
(C) Deltas
(D) Flood Plains
Choose the correct answer from the options given below:
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → (A), (C) and (D) only
A depositional landform is built up where a river slows down and drops the sediment it carries. An erosional landform is carved out where the river cuts into the land.
(A) Alluvial Fans Correct. Where a stream leaves the steep hills for a gentle plain, it suddenly slows and spreads its coarse load in a fan-shaped heap of deposits.
(B) River terraces Incorrect. Terraces are steps on a valley side that mark old valley floors or flood plain levels. They are left behind when the river cuts down deeper into its bed, so they are counted among the erosional landforms of running water.
(C) Deltas Correct. At its mouth the river slows on meeting the sea or a lake and deposits its load in layers, building a delta such as that of the Ganga–Brahmaputra.
(D) Flood Plains Correct. When the river overflows its banks, the floodwater spreads and leaves fine silt and clay on the low land beside the channel.