Definitions of different types of mixtures:
Solution: Molecules of one or more substances are distributed uniformly among molecules of another substance.
Suspension: Small particles of a substance are dispersed throughout a gas or liquid; the particles settle to the bottom if left undisturbed.
Colloid: Very small particles of one substance are distributed evenly throughout another substance; particles are smaller than those of a suspension and do not settle.
Which of the following is an example of a suspension?
Dirt particles are large and dense, and they will settle to the bottom (of a lake, for example) if left undisturbed. Paint, fog, and milk are colloids. Gasoline is a solution.