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An oxbow lake is formed from what?

Answer and explanation

Correct answer: From a cut-off river bend

Direct answer: Option A, a cut-off river bend. An oxbow lake develops on a floodplain where a river has a curved meander. Step by step: the river bends; erosion attacks the outer banks while deposition builds the inner banks; the bend becomes narrower at its neck; during high flow the river cuts through the neck; sediment then closes the old channel ends, leaving the curved loop as a separate lake. Option A is correct. Option B is wrong because sea depth does not form an oxbow lake. Option C is wrong because volcanic smoke cannot create this river landform. Option D is wrong because desert wind may move sand but does not cut off a river meander. Memory cue: an oxbow is the old, separated river bend.

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Oxbow LakeRiver BendMeander

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