You Are Working with a Soil Colloid Known to Have

question 37

Multiple Choice

You are working with a soil colloid known to have a reasonably high potassium level,a cation exchange capacity of about 20 cmol_c/kg of clay and little tendency to swell when wetted.Which of the following is it most apt to be the dominant clay mineral in this soil?

• A)vermiculite
• B)smectite
• C)kaolinite
• D)humus
• E)fine-grained mica

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