A bivariate choropleth map is a thematic map that displays two variables by using two different sets of symbols or colors in order to illustrate a relationship between the two variables. This map shows the population density and percentage change in that population over a period of time in Russia. It seems that the population change in rural Russia was negative as a whole.http://www.geog.le.ac.uk/russianheartland/DemographicMaps/images/PopulationMaps/RaionMaps/7RaionPopDenPerCh8902.jpg
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