This choropleth map, in which areas are shaded or patterned in proportion to the measurement of the statistical data being displayed on the map, displays the increasing divorce rates in America from 1980 to 1990. This type of map provides a simple way to visualize how a measurement varies across a geographic area or it shows the level of variability within a region.
http://axellelormans.wordpress.com/2010/02/
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