Particles in the surrounding environment that suspend in air and water affect the characteristics of some substances when combined with it. When you put some flour in a glass of water and stir it, flour will not dissolve entirely in a water, but it will settle down when left undisturbed. Visible particles of flour can be seen to the naked eyes as it makes the water cloudy.
Mixtures can be classified as solution, suspension, and colloids that differ in their solubility. Mixtures of tea leaves in hot water is an example of suspension. Tea leaves settle down at the bottom where you can see the two mixtures combined. Suspension is a kind of mixture where visible particles can be seen to the naked eyes as it settles down at the bottom when left undisturbed.