Which risk increases when Roman fortifications use timber-laced walls on unstable ground?

💡 Explanation

When timber-laced walls are built on unstable soil, differential settling occurs because the soil compacts unevenly under the weight of the structure, causing stress concentrations and cracking. Therefore differential settling fractures the structure, rather than fire vulnerability, bio-decay or impact resistance, which arise via different physical circumstances.

• Which improvement did Al-Khwarizmi introduce with transformative impact in early practical land surveying and irrigation planning?
• Which aspect of planetary motion did the equant, as used in Ptolemaic astronomy, attempt to resolve?
• Which limitation was mitigated by the introduction of copper sheathing on wooden ships' hulls in the 18th century?
• Which primary function did astronomers leverage when using the medieval Islamic quadrant instrument?
• Which navigational inaccuracy increases when a user fails to correct a sextant's side error completely?
• Which navigational error increases when a 18th-century sextant’s horizon mirror is misaligned relative to main frame perpendicularity?