Choropleth maps are a type of thematic map that uses different colors/shading to depict differences in a phenomenon or feature. This map uses different shades of blue to depict the water with drawls in terms of millions of gallons per day. Florida, who has large groundwater supplies, is one of the largest users of water while drier areas out west such as New Mexico do not have as ample water supply and therefore take out much less each day than Florida.
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