Bivariate choropleth maps display two different variables displayed on one map by including two different sets of graphic symbols or colors. The map to the right is a bivariate choropleth map comparing population density and population change in Russia.http://www.geog.le.ac.uk/russianheartland/DemographicMaps/images/PopulationMaps/RaionMaps/7RaionPopDenPerCh8902.jpg
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