Which outcome results when Roman road construction encounters unstable soil conditions?

💡 Explanation

When Roman road construction encounters unstable soil, differential settlement occurs because varying soil compaction leads to unequal load distribution, causing the road surface to crack. Therefore increased road surface cracking results, rather than blockage, collapse, or tilting which require different geological and structural conditions.

• Which mechanism causes the apparent retrograde motion of planets when observed using a medieval Islamic astrolabe?
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• Which outcome occurs when a blast furnace slag tap freezes prematurely during 18th-century iron production?
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