Choropleth Map- a map that uses predefined differences in shading or coloring within predefined areas to indicate the average values of a property or quantity within those areas.
A choropleth map uses a color scheme to show differences in a variable that is being mapped. Most choropleth maps only display one variable at a time, and can be made on any scale- country, state, county, etc. This map shows the acres of hay harvested across the US, with the scale being by county. The darkest counties have the highest harvest, and the lightest counties have the lowest.
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