Which consequence results from the Roman road construction technique of deep excavation and layering in marshy areas?

💡 Explanation

In marshy areas, deep excavation and layering disturb the anaerobic environment, resulting in anaerobic decay of organic material, which causes soil subsidence due to the loss of soil volume. Therefore, soil subsidence results, rather than increased lifespan or frost reduction which require stable soil conditions and different thermal processes.

• Which outcome results when exceeding design limits of a Roman arch bridge built with pozzolanic concrete?
• Which limitation hindered the application of early algebraic methods in medieval Islamic gear design?
• Which environmental outcome happened when early Mesopotamian irrigation canal silt levels consistently obstructed the Euphrates flow?
• Which iterative algebraic process did Al-Khwarizmi's method, 'al-jabr,' effectively apply to solve quadratic equations geometrically?
• Which challenge complicated Roman roads constructed over unstable marshland terrain?
• During ancient Mesopotamian canal construction, which risk increased due to poorly compacted canal walls?