An unclassed choropleth map shows changes in some kind of data using different coloring or shading. There is no specific shade or color to a specific piece of data, they have proportional degrees of darkness. This particular map shows the fertility rate in Europe, with the lightest shade being the lowest fertility rate and the darkest shade being the highest fertility rate.
http://www.esds.ac.uk/international/support/user_guides/gisoverview.asp
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