http://dwb4.unl.edu/Chem/CHEM869V/CHEM869VLinks/weather.about.com/newsissues/weather/library/weekly/aa071600a.htmAn isopleth map simplifies data that is continuously distributed. It shows the data being displayed as a third dimension on the map. This map measure acid rainfall in the United States by looking at the pH level of rain in different areas.
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