Fine pebbles are 2.0 to 5.0 mm in diameter. Sand is 0.05 to 2.0 mm in diameter. Which of the following statements is true? A.Fine pebbles have a lower terminal fall velocity than sand. B.Fine pebbles have a higher threshold velocity than sand. C.Fine pebbles are more vulnerable to wind erosion than sand. D.Fine pebbles in a river will be deposited after sand.

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The correct answer is D

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