Question

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? Fine pebbles have a lower terminal fall velocity than sand. Fine pebbles have a higher threshold velocity than sand. Fine pebbles are more vulnerable to wind erosion than sand. Fine pebbles in a river will be deposited after sand.

Answer 1

Fine pebbles have a higher threshold velocity than sand

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Answer 2

The correct answer from these choices is "Fine pebbles have a higher threshold velocity than sand."