Phases in the Mixture

A mixture of water, sand, and oil will have three phases:

* Water Phase: Water is a liquid and will form one distinct phase.

* Oil Phase: Oil is also a liquid, but it's immiscible with water (they don't mix). This will form a separate, distinct phase.

* Sand Phase: Sand is a solid and will form a third separate phase, settling to the bottom.

Separating the Substances

You can separate these substances using a combination of methods:

1. Decantation: Carefully pour off the oil layer, leaving the water and sand behind.

2. Filtration: Use a filter paper to separate the sand from the water. The sand will be trapped on the filter, while the water passes through.

Note: It's important to let the mixture settle completely for the phases to separate before attempting to decant.