Question

Write how and where sandbars are formed in a river channel.
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Answer 1

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Over a long enough period of time, the combination of deposition along point bars, and erosion along cut banks can lead to the formation of an oxbow lake. A mouth bar is an elevated region of sediment typically found at a river delta which is located at the mouth of a river where the river flows out to the ocean.

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Answer 2

Explanation:

The sandbars when exposed are known as 'Barrier bars' or beaches. These sandbars are formed at the time of a high water level during a storm or at the season of the high tide.  

The sand brought in by the water over a long period of time combines and deposits along with the bars and banks that are shaped by erosion, ultimately leading to the formation of an 'oxbow lake', at the mouth of the river.