25. According to Study 3, sand would most likely be completely washed away by water moving at a velocity of:
Your Answer is
Correct Answer is D
Explanation
According to the description in the last two lines of Study 3, we found that the flat bed means that the sediment on this layer has moved, and it is not completely washed away. According to table 3, it can be found that the water flow velocity has reached 120cm/s, and the sand sediment has just formed a flat bed, indicating that a faster flow velocity is required to completely wash away.