Source - http://www.personal.psu.edu/faculty/c/a/cab38/GEOG321/14_multivariate02/multivariate.html
This is bivariate choropleth map that compares two (bi) variables (variate) on a single map. On this map it explains the percent change in pop. through 1990-2000 and compares it to the people per square mile. This map patterns are that people where moving south away from the north as you can see in West Virginia by it being the lightest of the colors as in Georgia and florida being the darkest of the colors.
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