http://geology.about.com/od/sediment_soil/ss/Soil-Classification-Diagram.htm
Triangular plots also known as ternary plots are used to plot three variables against each other that sum to a constant. It is commonly used in the physical sciences to show three different parts of a whole such as above. This triangle was presented to me in my physical geography class displaying the different percent concentrations of clay, sand, and silt that make up different loams.
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