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    Question

    What is the diameter of clay particles

    A 0.2-2mm Correct Answer Incorrect Answer
    B 0.02-0.2 Correct Answer Incorrect Answer
    C 0.002-0.02 Correct Answer Incorrect Answer
    D <0.002 Correct Answer Incorrect Answer

    Solution

    Clay particles are smaller than 0.002 mm in diameter. Some clay particles are so small that ordinary microscopes do not show them.

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