Which soil issue was amplified where terrace irrigation failed during Incan agriculture?

💡 Explanation

Topsoil erosion accelerates because when terrace walls crumble during irrigation failure, sheet erosion increases due to gravity pulling soil down slopes rather than water distributing evenly; therefore increased erosion accelerates, rather than the other listed soil changes.

• Which mechanical outcome accelerated the decline of Roman aqueducts after the 5th century AD?
• In historic Mughal monuments utilizing pietra natura, which failure increases when the surface heats unevenly?
• Which consequence results when an astrolabe's alidade is severely warped?
• During winter, which outcome reduces the structural integrity of a Roman aqueduct's arched keystone?
• Which navigational outcome improved due to the 18th-century adoption of the Harrison chronometer on long sea voyages?
• Which consequence occurred within the Inca administrative system when quipu knotting errors exceeded established verification thresholds?