Which consequence commonly resulted in the gradual collapse of ancient hillside terracing systems?

💡 Explanation

Increased soil moisture leads to slope instability because pore water pressure, via the mechanism of soil liquefaction, reduces effective stress. Therefore, slope failure occurs rather than stable terraces because the soil cannot handle the weight above.

• Which outcome results from intensified maize cultivation in the ancient Three Sisters system without nutrient replenishment?
• Which visual distortion arises because imperfections in ancient lens grinding?
• Which optical phenomenon enabled Ibn al-Haytham's precise determination of star distances using parallax?
• Which structural risk increases when Roman roads experience thermal expansion during seasonal heat cycles over decades?
• Which irrigation outcome frequently afflicted complex Mughal gardens employing extensive pietra dura pathways?
• Which risk increases when pre-Columbian Andean terrace farming lacked sufficient drainage channels?