Bivariate Choropleth Map

To be classified as Bivariate Choropleth map two main characteristics must be fulfilled. First of off there must be two obviously present variables shown and the other is that these variables are used along with areal data. In the map above it shows two distinct things, the ratio of Olympic athletes per capita along with the fact, if they are winter or summer competitors.

http://www.directionsmag.com/images/articles/sportsillustrated/Olympic_Athletes.jpg