Choropleth maps are a type of thematic map that categorizes the statistical information by use of color coding or shading. A choropleth map is a great way to visualize the density of statistical information over a geographical area. The above choropleth map is of national water use in 1990. By means of color coding, it is easy to see from the key that the states in red consume the most water per day while the states colored dark blue consume the least.
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