Asample of concrete contains cement, gravel, crushed rocks, sand, and water. each of these contains different metals and minerals and hence has different colors and different properties. which term or terms could be used to describe this sample of concrete?

As the concrete has cement, gravel, crushed rocks, sand, and water of different physical state and can be separated by physical methods hence it should be called as a mixture.

As the components have significant physical boundaries which clearly identify their presence, the mixture is heterogeneous and not homogeneous.

Thus this is a concrete is a heterogeneous mixture of cement, gravel, crushed rocks, sand, and water