Meaning: Powder used for building was combined with fine loose material and a liquid.
Choice of Words: Cement is a powder used for building. Mixed means it was combined with something. Sand is fine loose material. Water is a liquid.
Alternative Expressions
Concrete is a mixture of cement, sand, and water.
Meaning: This is another way to describe concrete and how it is made.
Choice of Words:Concrete is the name of the material that is made when cement, sand, and water are mixed together. Mixture means that different things are combined together.
When cement, sand, and water are mixed together, they form concrete.
Meaning: This is a more detailed explanation of how concrete is made.
Choice of Words:Form means to create something. In this case, the cement, sand, and water are coming together to make concrete.