Which risk is amplified in ancient terrace irrigation systems due to gravity's influence on soil saturation?

💡 Explanation

Because of gravity, water percolating through upper terraces accumulates in lower terraces, thereby increasing pore pressure which intensifies slope instability via soil weakening. Increased instability results with excess saturation, rather than changed solar properties/depletion rates/transpiration, which rely on material composition/biological demand and atmospheric drying.

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