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← HistoryWhich outcome occurs when terrace steps degrade and collapse during cultivation of maize?
A)Increased erosion rates on slopes✓
B)Enhanced water retention capacity
C)Greater sunlight penetration to crops
D)Reduced risk of nutrient leaching
💡 Explanation
Increased erosion occurs because terracing relies on stepped contours to reduce runoff; when the terrace steps fail, the slope length effectively increases. This increases the water velocity, therefore more soil is carried away rather than retaining soil and water with well-maintained steps.
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