Soils Containing Smectite Clay Minerals Have a High Potential for Swelling

question 80

Multiple Choice

Soils containing smectite clay minerals have a high potential for swelling and shrinking because

• A) the relatively large, plate-shaped clay crystals pack together tightly.
• B) the very small clay crystals have a large surface area to attract water molecules.
• C) the clay-rich soils allow water to percolate through easily.
• D) organic matter in the soils retains water during dry periods.
• E) the soil particles break apart easily during freeze-thaw cycles.

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