A mixture of solid and liquid that will separate if allowed to stand is called a suspension.

Here's why:

* Suspension: The solid particles are larger and not dissolved in the liquid. They are simply dispersed throughout the liquid. Over time, gravity will pull the heavier solid particles to the bottom, causing the mixture to separate.

Examples of suspensions:

* Sand in water: The sand particles will settle to the bottom of the container.

* Muddy water: The mud particles will settle out, leaving clear water on top.

* Flour in water: The flour particles will eventually settle to the bottom, though it might take longer than sand or mud.

Let me know if you have any more questions!