Which mechanism causes the formation of terraced alluvial fans in arid environments after prolonged tectonic uplift?

💡 Explanation

When base level drops due to uplift, cycles of incision and aggradation result because the river's downcutting ability increases during wetter periods, and deposition becomes dominant during drier periods, creating terraces. Therefore option "A" results, rather than other options such as chemical, aeolian or glacial, which do not match the forcing conditions.

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