A thematic map
shows information on a topic superimposed over a base map. These types of maps
or charts are designed to show a particular theme connected with a specific
geographic area. They can portray physical, social, political, cultural,
economic, sociological, agricultural, or any other aspect of a city, state,
region, nation, or continent. The map displayed above is considered a thematic
map because it shows the estimated median household income (the theme/topic) of
the United States. The different variations of the median household incomes are
shown using different shades of red.
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