Iron fillings are added to water, and sink to the bottom. Is this a mixture or a solution?

Mixture. Mixtures separate, solutions do not.

Answer: It is a Mixture

A mixture is a combination of different things that are not chemically bonded.

A solution is a special type of homogeneous mixture composed of two or more substances. A solute is a substance dissolved in another substance, known as a solvent and when this happens a solution is formed