Final answer:
Liquid water is classified as a solution.
Step-by-step explanation:
A solution is a homogeneous mixture composed of a solute dissolved in a solvent. In this case, the solute is the substance that is being dissolved, and the solvent is the substance in which the solute is dissolved. Based on this definition, liquid water would be classified as a solution since it is a homogeneous mixture of water molecules. Concrete, water, or gaseous could be the answer. On the other hand, a mixture of liquids, gasses, and solids could constitute a solution.