23. Based on the results of Study 2 for a given soil, the addition of dyed sand to the moving air produced a threshold wind speed that was approximately:
Your Answer is
Correct Answer is A
Explanation
Looking at table 2, when no sand added, the threshold wind speed is about 0.3;
When sand added, the threshold wind speed is about 0.2, which is 1/3 smaller than that without sand
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