What do two or more substances combined together, but not chemically, form?

When two or more substances are combined together without undergoing a chemical reaction, they form a mixture. A mixture retains the individual properties of the substances involved; for instance, if you mix sand and salt, both components maintain their properties and can be separated through physical means.

In contrast, a solution is a specific type of mixture where one substance is dissolved in another, creating a homogeneous mixture, such as saltwater, but that's not the general definition of a mixture. A compound refers to a substance formed when two or more elements chemically bond together in a fixed ratio, resulting in properties that differ from those of the individual elements. An element is a pure substance that cannot be broken down into simpler substances, representing the most basic form of matter.

Thus, the correct term for the combination of substances that retains their distinct properties and can be physically separated is a mixture.