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 optical consequence resulted from medieval Islamic scholars grinding spherical lens surfaces for astronomical instruments?
• Which mechanism enabled Roman aqueducts to maintain a consistent water flow across valleys despite elevation changes?
• Which limitation arises when using early astrolabes to measure distant star altitudes near twilight?
• Which structural consequence occurred when ships transitioning from carvel to clinker planking experienced ice impacts?
• Which mechanism explains the reduced hull displacement experienced during 18th-century ship construction from green timber?
• Which risk increases when a wooden ship hull is constructed using unseasoned timber in 18th century?