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← HistoryWhich outcome limits water infiltration in stepped terraces of ancient wadi farms?
A)Calcareous layer accumulation forms hardpan✓
B)Clay content optimizes capillary action
C)Coarse sand increases overall permeability
D)Organic mulch enhances soil absorption
💡 Explanation
Caliche accumulation reduces water infiltration via the **precipitation-dissolution process**, wherein dissolved calcium precipitates clog pores. Because the hardpan layer reduces permeability, water cannot flow through effectively, therefore hindering root water access; enhanced absorption requires water flow through soil, rather than impeded.
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