What type of substance is dirt?!

Soil is composed of small pieces of a variety of materials, so it is a heterogeneous mixture.

A substance containing only one type of atom or one type of molecule is a pure substance. Most of the matter around us, however, consists of mixtures of pure substances. Air, wood, rocks and dirt are examples of such mixtures. Mixtures can be further classified as Homogeneous and Heterogeneous.