Which construction challenge did Roman builders face when constructing fortifications on unstable clay soils?

💡 Explanation

When building on unstable clay, uneven soil consolidation occurs because clay compresses differently under varying loads, leading to differential settlement and cracking in rigid structures. Therefore structural cracking resulted, rather than chemical erosion, material limitations, which involve completely different mechanisms and processes.

• Which outcome resulted from the ancient Andean civilizations' usage of terrace farming on steep slopes experiencing heavy rainfall?
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