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← HistoryAcross generations which risk increased when pre-Columbian Andean terraces suffered from insufficient drainage management?
A)Collapse from hydrostatic pressure buildup✓
B)Wind erosion of topsoil increases
C)Decreased nitrogen fixation rates
D)Thermal expansion causes cracking
💡 Explanation
Hydrostatic pressure increased because improper water management led to water accumulation behind the terrace walls. The mechanism is pore water pressure which reduced the soil shear strength therefore the retaining structure failed, rather than simpler soil erosion failures without damming.
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