Suppose Mount Rushmore is a famous American landmark located in the Black Hills of South Dakota. The sculpture features the faces of four former U.S. presidents: George Washington, Thomas Jefferson, Theodore Roosevelt, and Abraham Lincoln. It was completed in 1941 under the direction of sculptor Gutzon Borglum.
Can we infer that "Mount Rushmore is a natural rock formation untouched by human hands."? Yes, no, or maybe?