How is an oxbow lake formed?
a. an oxbow lake is formed when a lake shrinks due to erosion.
b. an oxbow lake is formed when the wide bend of a river is cut off.
c. an oxbow lake is formed when high concentrations of salt are present in lakes.
d. an oxbow lake is formed when a dam or levee is built on a river.?

The correct option is B

A meander is a curve described by the course of a river, whose sinuosity is pronounced. They are formed more easily in the rivers of the alluvial plains with very little slope. The sediments are usually deposited in the convex part of the meander, advancing the shore, while in the concave, due to the centrifugal force, erosion and the recoil of the shore predominate. The combination of the advance of the shore in the convex parts and the recession in the concaves produces the migration of the channel and, therefore, the development of the meander.

When two curved channels meet due to erosion, the river cuts its way through the area where the currents are opposed and a lake of horseshoe or oxbow lake is formed, since the sediments close the entrance and exit of the old meander, being outside the channel of the river.

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