Triangular plot are used to show the interaction between three variables. In an equilateral triangle, the ratios of the three variables are shown as positions in the triangle. It is widely used in geological studies but it can be used to analyze any three variable system. Here, the proportions of the three variables must always sum to zero for the plot to be valid. In this triangular plot soil textures are defined by proportions of sand, silt, and clay. This would be used to determine the type of soil based on the three properties.
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