Which effect allowed Roman fortifications, like Hadrian's Wall, to maintain structural integrity despite lacking modern mortar?

💡 Explanation

When stones are carefully shaped and interlocked in a dry-stone construction, mechanical interlocking results because the geometry prevents slippage and distributes load, providing stability. Therefore interlocking blocks maintains structural integrity, rather than capillary action, thermal expansion or electrostatic attraction which offer minimal support under load.

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