Which risk increased when pre-Columbian Andean communities expanded terrace agriculture onto steeper slopes?

💡 Explanation

When terrace agriculture expanded onto steeper slopes, increased water runoff absorption occurred due to unconsolidated terrace fill, leading to soil water saturation and pore pressure increase, causing slope instability. Therefore catastrophic landslides are more likely, rather than crop failure, salt accumulation, or frost damage, which require different agricultural deficiencies.

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