37. Compare the results of the 2 trials in Study 2. In which trial did the volume of runoff per 20 min reach a greater maximum value, and in which trial did the volume of runoff per 20 min decrease to zero from the maximum value in the shorter amount of time?
Your Answer is
Correct Answer is D
Explanation
As can be seen from figure 2, the maximum value of the ordinate of the curve without sand layer is larger, and the first ordinate to drop to 0 is without sand layer