Which structural risk increases when Roman roads experience thermal expansion during seasonal heat cycles over decades?

💡 Explanation

When Roman roads undergo repeated thermal expansion, compressive stress accumulates because the road materials are constrained. This causes buckling and cracking due to exceeding the compressive strength. Therefore, buckling is greater risk, rather than A, B, and D which involve distinct mechanisms like material separation, compaction, or water damage.

• Which risk increased when a Roman siege ramp (agger) was extended close to enemy walls?
• Which mechanism maintains soil stability on Inca agricultural terraces during heavy rainfall events?
• Which consequence results from increased humidity affecting an 18th-century marine chronometer's balance wheel?
• Which outcome resulted when 16th century chinampa farmers near Tenochtitlan densely planted maize year-round without fallow periods?
• Which structural issue was addressed by the bent-axis approach in Mesopotamian ziggurat construction?
• Which optical effect enabled Ibn al-Haytham to more accurately describe the human vision process?