Isopleth maps show contour lines depicting a variable such as population. This map shows hydrogen ion concentrations throughout the U.S. It can be useful for a great number of things such as census taking, economics or business.
http://dwb4.unl.edu/Chem/CHEM869V/CHEM869VLinks/nadp.sws.uiuc.edu/isopleths/maps1998/phfield.gif
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