The crossword solution for the term SETS, AS CEMENT is HARDENS, with 7 letters. Cement is a material used in construction that HARDENS when mixed with water and dries. It is made from a combination of materials such as limestone, clay, and sand, which are heated and then ground into a powder. When mixed with water, cement forms a paste that binds together other materials to form a solid structure. The process of hardening is known as hydration, and it occurs when the cement reacts with the water to form crystals. These crystals bind together the other materials, creating a strong and durable structure.