What type of map expresses a single attribute or theme?

A thematic map is specifically designed to illustrate a particular attribute or theme across a given area. This type of map focuses on a single subject, such as population density, climate patterns, or land use, making it an effective tool for visualizing data related to that specific theme. By emphasizing a unique aspect, thematic maps allow users to quickly grasp spatial distributions and relationships tied to that particular characteristic.

In contrast, other types of maps, like topographic maps, political maps, and physical maps, serve broader purposes. Topographic maps depict elevation and landforms but include multiple features like roads and vegetation. Political maps focus on the boundaries and names of political entities, such as countries, states, and cities, yet do not center on a singular thematic subject. Physical maps showcase natural landscapes and geographical features without isolating one particular theme, encompassing aspects like mountains, rivers, and deserts.

This distinction underscores why the thematic map is the correct choice for expressing a single attribute or theme, as it is purposefully crafted to visually communicate specific information in a concentrated manner.