Which mechanism explains why the Romans could build arches from individual voussoirs without mortar?

💡 Explanation

When the keystone is placed at the apex, compression distributes the load because the wedge shape of the voussoirs directs forces along the arch, preventing collapse. Therefore keystone compression results, rather than tensile strength, cohesive forces, or interlocking shapes which describe other stabilization methods.

• On pre-Columbian chinampa farming, which mechanism maintains soil fertility over extended periods despite intensive cultivation?
• Which structural issue primarily limited the height of Roman defensive walls before the widespread use of concrete?
• Which environmental risk challenged Roman aqueduct design when traversing areas with limestone bedrock?
• Which issue arises when inadequate drainage exists alongside a Roman road built on clay-rich soil?
• Which outcome results from the use of forced-air induction in early piston-engine aircraft operating at high altitude?
• Which risk increased during Roman road construction across marshland using the 'agger' method?