Here's why:

* Substances: A mixture is made up of two or more distinct substances. These could be elements, compounds, or even other mixtures.

* Same place: The substances are physically together in the same location.

* Not chemically combined: The substances retain their individual properties and can be separated by physical means.

Examples of mixtures:

* Salt and pepper: You can see the individual grains of salt and pepper.

* Sand and water: The sand settles to the bottom, and the water can be poured off.

* Air: A mixture of gases, primarily nitrogen and oxygen.

Let me know if you have any other questions!