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← HistoryWhich outcome occurs when prolonged heavy rainfall saturates the terraces of ancient Andean hillside agriculture?
A)Surface erosion and soil creep✓
B)Increased nitrogen fixation by microbes
C)Enhanced crop pollination efficiency
D)Accelerated decomposition of organic matter
💡 Explanation
When heavy rain saturates terraces, the increase in pore pressure reduces soil shear strength, triggering surface erosion and downslope soil creep because of gravity. Therefore, surface erosion occurs, rather than nitrogen fixation, pollination enhancement, or accelerated decomposition which require different conditions.
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