An isopleth is a contour
line that connects points that have an equal value of a certain variable at a
certain time and in a certain area. This variable can be many things including
temperature and population. Isopleths also show a continuous distribution of
data. This isopleths shows the hydrogen ion concentration as pH from
measurements made at the field laboratories in 1998. The highest levels of
field pH are represented by shades of green with the darkest shade being the
greatest, and the shades of orange represent the lowest levels of field pH with
the darkest being the least. The western side of the United States presents the
highest levels of field pH, while the eastern side of the United States
presents the lowest levels of field pH.
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