What U.S. monument is held together only by gravity and friction? Correct
The U.S. monument that is held together only by gravity and friction is the Washington Monument, not the Gateway Arch, Mount Rushmore, or the Golden Gate Bridge. The Washington Monument, a towering obelisk in Washington, D.C., is constructed from marble, granite, and bluestone gneiss, with each massive stone block relying on its weight and the force of friction to remain in place. Unlike the other options listed, such as the Gateway Arch, Mount Rushmore, and the Golden Gate Bridge, which utilize various construction techniques and materials to support their structures, the Washington Monument stands as a remarkable example of engineering where its stones are primarily held together through the fundamental forces of gravity and friction, making it the correct answer among the choices provided.
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