Yes. It's a mixture of many stuffs which are found in nature, but the process of mixing it together is man-driven.
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It is man made
Portland cement is made of,CaoSiO2Al2O3Fe2O3MgOAlkaliesSO3
cement is made with water cement mixture and sand after all of this is added
Concrete is to bread as cement is to flour. Concrete is a mixture of sand, gravel, cement, and water.
Steel