The stone walls of the Inca have withstood many earthquakes. What technique did Inca builders use that gave their walls more structural resistance to these natural disasters?

A. The use of strong resilient mortar that held the stones tightly in place even under the greatest stress.
B. Placing stones in a zigzag formation that gave the walls additional structural support.
C. The use of large boulders that had enough mass to hold them in place during tremors.
D. Resting concave and convex stones against each other to create a space to allow the stones some freedom of movement.

The Inca builders used advanced techniques to create earthquake-resistant walls. They shaped stones in concave and convex shapes that allowed for movement during tremors, and they arranged stones in a zigzag pattern for added structural support.

Explanation:

The Inca builders employed a unique and effective technique to construct their stone walls that offered incredible resistance to natural disasters such as earthquakes. They expertly cut their stones to create concave and convex shapes that they could rest against each other. This technique created a degree of freedom of movement for the stones. This means during tremors, rather than breaking or collapsing, the stones could simply shift and settle back into place. Another technique Inca builders used was connecting stones in a zigzag formation. This formation added additional structural support and stability to the walls, giving them the resilience to withstand earthquakes.

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