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Which outcome occurs when extensive unreinforced terrace farming increases hillside saturation?

A)Subgrade yielding and terrace collapse
B)Enhanced crop nutrient uptake rate
C)Increased evapotranspiration and cooling
D)Decreased sediment flux in rivers

💡 Explanation

Terrain saturation increases pore pressures that weaken soil shear strength, because the hillslope loses its cohesive support via increased hydrostatic forces, therefore slope instability leading to terrace collapse occurs, rather than plant benefiting since the failure is mechanical, not biological.

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