Classify each of the following as a homogeneous or heterogeneous mixture: 
Soda water, wood, air, soil, vinegar, filtered tea.

A homogeneous mixture has uniform composition and appearance.

A heterogeneous mixture consists of visibly different phases or substances.

From the list of given substances:

Homogeneous mixtures are soda water, air, vinegar, and filtered tea.

Heterogeneous mixtures are wood and soil.