http://www.globalchange.umich.edu/globalchange1/current/lectures/kling/water_nitro/water_and_nitrogen_cycles.htm
An Isopleth is a line connecting the points on a map that show equal values of some variable, typically related to some geographical event, numerically. The map below shows the areas of US in regards to the pH value of rainfall in the different parts of the country paralleled to the area's sensitivity to atypically acidic rain.
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