Which process determines natural eutrophication in lake ecosystems within flat floodplains?

💡 Explanation

When rivers regularly flood, alluvial deposition occurs because sediment is transferred into the lake during flooding, building up organic matter and nutrient concentrations. Therefore, increased nutrient load results, driving eutrophication, unlike option A, causing opposite impact. Neither option C nor D explains eutrophication, they detail conditions needed for other geographic processes.

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