Which of the following geologic materials would have the highest groundwater velocities and be least effective in removing unwanted pollutants from the water?
A)unconsolidated medium- grained sand; sand grains are coated with clay minerals
B)limestone; numerous solution channels and fractures widened by dissolution
C)lakebeds; unconsolidated very fine- grained sand and silt
D)sandstone; well- cemented with a few, widely spaced vertical fractures

Question

Quizplus · Accepted Answer

Limestone with numerous solution channels and fractures widened by dissolution would have the highest groundwater velocities due to the large void spaces allowing water to move rapidly. This structure would also be least effective in removing pollutants because the fast flow gives less time for the water to interact with the rock material, which could potentially filter out contaminants.

Which of the Following Geologic Materials Would Have the Highest