Which risk increased when the Inca precision stonemasonry lacked mortar?

💡 Explanation

Seismic vulnerability increased with the construction. The dry-stone walls relied on precise joints transferring stress, a process called interlocking stones. Because seismic forces can shift individual blocks and weaken the whole structure, rather than in mortared walls which distribute forces more evenly, the risk was intensified; therefore interlocking alone was essential.

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