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A bend in a river shaped like a loop is called an oxbow. Oxbow lakes are formed when a meander is cut off from the main river channel, often due to erosion and sediment deposition.
A river!
meand
it is when abrasion starts
its called a meander
meanders
Renal Column Loop of henle.
meander
A loop-like bend of a river, often referred to as a meander, is a curve or bend in the river's course that develops as the water erodes the outer bank and deposits sediment on the inner bank. This process creates a distinct, winding shape as the river flows through relatively flat terrain. Over time, meanders can become pronounced and may even lead to the formation of oxbow lakes if a bend is cut off from the main flow. These features are important for the river's ecosystem, influencing habitat diversity and sediment transport.
its called a meander
An oxbow lake forms when the neck of a river bend erodes enough to meet. This will realign the river, which then flows on a new straighter course. The now isolated previous loop in the river remains as the oxbow (shaped) lake.