Which risk increases when Inca terracing lacked drainage?

💡 Explanation

Slope instability increases because soil saturation from inadequate terraces drainage increases pore water pressure, decreasing effective stress; therefore landslides occur, rather than simply slowed crop growth, because collapse involves a geomechanical thresholds.

• Which observational consequence results from atmospheric refraction during astronomical observations at low angles, specifically at sunrise/sunset, with astrolabes?
• Which navigational error increases when a marine sextant's horizon mirror has significant perpendicularity error relative to the frame?
• Which consequence results when repeated firing of a Han Dynasty automatic crossbow leads to structural changes in the bronze trigger mechanism?
• Which challenge arose when early Chinese crossbows using cast iron triggers attempted greater draw weights?
• Which structural weakness arises when a Roman castrum wall's foundational drainage system fails due to silt accumulation?
• Which effect reduced artillery range when early cannons overheated during prolonged sieges within Roman fortifications?