Answer
An erosional floodplain develops through the continuous lateral erosion of a meandering stream. As the stream meanders, it erodes the outer banks of its curves and deposits sediment on the inner banks. Over time, the meanders migrate, and the process of erosion and deposition continues, widening the valley. The floodplain is formed as the valley widens, and the stream cuts into the surrounding landscape, creating a broad, flat area that is prone to flooding during high-flow events.
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