Concrete

Concrete is a composite material composed of aggregate bound together with a fluid cement that cures to a solid. It is the second-most-used substance, the most widely used building material, and the most-manufactured material in the world.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0

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Every species, image, fact, and figure is drawn from Wikipedia and Wikimedia Commons, used under public-domain and Creative Commons licenses. No content is AI-generated.