* Heterogeneous mixtures have components that are not evenly distributed throughout. You can usually see the different parts of the mixture.

* Homogeneous mixtures have components that are evenly distributed, making the mixture appear uniform throughout.

In the case of sand and salt:

* Sand is a granular material with varying sizes and colors.

* Salt is a crystalline solid.

When you mix sand and salt, you can easily distinguish the individual grains of sand from the salt crystals. This uneven distribution makes it a heterogeneous mixture.