Which structural deformation in Roman castra earthen ramparts increased risk when besieging forces tunneled beneath?

💡 Explanation

When besieged forces tunneled, creep from compaction under load occurred because the earthen ramparts slowly deformed due to added stress from the removed material underneath, increasing the risk of collapse. Therefore, creep resulted, rather than thrust, shear, or heave which require different environmental conditions and geological vulnerabilities.

• Which outcome occurs when ancient terrace systems cultivating maize experience prolonged heavy rainfall?
• Which limitation constrained the accuracy of pre-telescopic astronomical observations using astrolabes?
• Which functional limitation arised in early astrolabes due to inaccurate star position data?
• Which effect commonly restricted the maximum height of Inca terrace farming systems?
• Which effect complicates precise hour angle calculation using a medieval astrolabe at high latitudes?
• Which environmental consequence followed the shift to intensive maize cultivation in the pre-Columbian Valley of Tehuacan?