Discussion
A standard soil texture triangle represents __________ soil textural classes reflecting specific percentages of sand, silt, or clay.
Answer: C
The standard soil texture triangle represents 12 textural classes.
The USDA soil texture triangle plots the percentages of sand, silt and clay on its three sides and divides the area into 12 classes: sand, loamy sand, sandy loam, loam, silt loam, silt, sandy clay loam, clay loam, silty clay loam, sandy clay, silty clay and clay.
Any soil's position on the triangle, from its laboratory analysis, places it in one of these twelve. The figures 24, 30 and 36 do not correspond to the standard triangle.
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