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Which is the most accurate example of the constructive role of a river?

Answer and explanation

Correct answer: Forming alluvial plains and deltas

Direct answer: Option C, forming alluvial plains and deltas. A constructive role means a river builds or creates land, mainly by depositing sediment. When deposited material spreads over a valley or plain, it can form an alluvial plain. Near the river mouth, sediment may accumulate and form a delta. C is correct because both are depositional landforms made by river action. A, increasing bank erosion, is destructive rather than constructive. B, damaging settlements, is a harmful effect of flooding, not land construction. D, spreading polluted water, is pollution and has no constructive geographical meaning. Constructive does not mean every result is beneficial to people; it means material is laid down to build a landform. Memory cue: deposition builds plains and deltas.

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DrainageRiversConstructive-Role

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