http://www.ilstu.edu/~jrcarter/Geo204/Choro/map-AmFact-4round-green-80pct.jpgChoropleth maps are used to compare information throughout the map. For instance, this map compares the number of males per every hundred females within that state. It uses shades of colors for different numbers of males. The darker the green the more males compared to every hundred females. Each area or class is assigned a different symbol or color in a classed choropleth map.
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