Which consequence ultimately destabilized Inca retaining walls supporting terraces?

💡 Explanation

Hydrostatic pressure infiltrated saturated soil behind Inca retaining walls; the Pore Water Pressure mechanism increased; this caused outward force on the masonry. Therefore, the wall failed because of accumulated water pressure, rather than seismic forces affecting surrounding bedrock stability.

• Which outcome occurred in early versions of shadoof irrigation systems when the water source level was significantly lowered during the dry season?
• Which optical phenomenon did Alhazen (Ibn al-Haytham) utilize to improve the accuracy of sundials?
• Which consequence arose when the earlier mariner's astrolabe was replaced by the octant during 18th-century navigation?
• Which mechanism maximizes fountain jet height in Mughal garden water features when pumps fall short?
• Which strategic advantage derived from the Byzantine secret weapon known as Greek Fire, helped foster alliance negotiations?
• Which outcome occurred when early tests of Greek Fire employed impure naphtha?