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  2. Concrete - Wikipedia

    en.wikipedia.org/wiki/Concrete

    Concrete is a composite material composed of aggregate bonded together with a fluid cement that cures to a solid over time. Concrete is the second-most-used substance in the world after water, [1] and is the most widely used building material. [2] Its usage worldwide, ton for ton, is twice that of steel, wood, plastics, and aluminium combined. [3]

  3. Gateway Arch - Wikipedia

    en.wikipedia.org/wiki/Gateway_Arch

    The Gateway Arch is a 630-foot-tall (192 m) monument in St. Louis, Missouri, United States.Clad in stainless steel and built in the form of a weighted catenary arch, [5] it is the world's tallest arch [4] and Missouri's tallest accessible structure.