Here's why:

* Suspension: A suspension is a heterogeneous mixture where particles of one substance are dispersed throughout another but don't dissolve. The particles are large enough to be seen with the naked eye and will settle out over time. Flour particles in water are a perfect example – they don't dissolve, and you can see them swirling around in the water.

Let me know if you'd like to know more about different types of mixtures!