Which environmental risk shortened lifespan of Roman roads traversing clay-rich soil?

💡 Explanation

When water saturates clay-rich soil it expands, undergoing significant volume changes caused by ice crystal formation and expansion during repeated freeze/thaw cycles. Therefore, subsurface heaving results rather than thermal expansion, root penetration, or runoff which require different external factors and soil compositions.

• Which mechanical outcome arises in 11th-century mechanized clocks when using algebraic ratios in the gear trains?
• Which risk increased when Roman siege engines like ballistae exceeded their design firing range?
• Which outcome arises when timber ships, during the 18th century, exceeded longitudinal strength limits during construction?
• Which risk significantly increased when the three-field crop rotation system was adopted in medieval Europe?
• Which consequence occurred when inadequately seasoned timber was used for 18th-century shipbuilding construction?
• Which systematic error increases when using a sextant with a loose index mirror on a sailing ship?