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Why does a river repeatedly form bends in plains?

Answer and explanation

Correct answer: Because lateral erosion and deposition occur together

A meander is a broad bend in a river channel. In plains, the land usually has a gentle slope, so the river does not simply cut straight downward. Water moves faster along the outer bank of a bend and erodes that bank. It moves more slowly along the inner bank, where sand and silt are deposited. This unequal erosion and deposition gradually makes the bends larger and may create winding channels.

Option B is correct because lateral erosion and deposition occur together and produce meanders. Option A is incomplete and describes mainly downward erosion, which is more important in steep upper courses. Options C and D are not suitable explanations: river water does not always freeze, and ordinary sea waves do not push rivers backward to form bends in plains. Therefore, B correctly explains the process.

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DrainageRiversMeanders

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