Answer:
As the river enters the plain, its speed reduces, this is called the second course of river. The twist and turns form bends called meanders. Continuous erosion and deposition by the side of meanders form closer loops. These get cut from the river and form cut-off lake called ox-bow lake. Deposition of fine soil and other sediments by the river bank led to formation of fertile flood plains. The raised banks are called levees.
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