http://www4.uwsp.edu/geo/faculty/ritter/geog101/textbook/essentials/map_types.html
Thematic Maps are maps that are made to show a certain theme or pattern in each map. This map conveys a drought severity index and the different colors represent the different amount of drought in the area. It qualifies as a thematic map because there is a pattern in the map that shows droughts are happen more in the southern part of the United States.
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