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Which limitation affected Incan terrace agriculture during El Niño?

A)Increased soil salinization rates
B)Reduced nitrogen fixation efficiency
C)Slope instability becomes widespread
D)Decreased irrigation canal capacity

💡 Explanation

Slope failure increases, because the infiltration of excess rainwater during El Niño saturates the terrace soil exceeding the *shear strength* limit, therefore destabilizing the slopes and causing landslides, rather than directly reducing soil nutrients or damaging canals.

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