Isopleth maps consist of lines connecting of equal value of distribution for a given theme such as rainfall and temperature. In this photo the acid rain was recorded and distributed on a map of the eastern U.S. The pH levels are represented by color with red being the highest and blue the lowest. Notice that in the Northeast where it is conjested, the pH is higher. Alot of the acid rain is formed in heavily populated areas and where big factories are located.
Isopleth
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