Which stability risk increases at the base of large masonry pyramids built without mortar, like some in Mesoamerica?

💡 Explanation

Seismic wave amplification can occur because soil beneath pyramids can focus seismic waves vertically; therefore, stresses increase at the base, rather than compressive failure or simple foundation settling because wave interference amplifies energy as waves travel.

• Which effect limited quality of early camera obscura images projected using a pinhole as the aperture?
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