Which of the following geologic materials would have the highest groundwater velocities and be least effective in removing unwanted pollutants from the water?
A) a sandy loam soil with high organic carbon content
B) limestone with numerous solution channels and fractures widened by dissolution
C) lakebeds consisting of unconsolidated very fine-grained sand and silt
D) sandstone; well-cemented with a few, widely spaced vertical fractures
Correct Answer:
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