Which one of the following aquifers would be best for purifying groundwater that is contaminated with harmful sewage bacteria?
A)highly fractured granite
B)coarse gravel with few small grains
C)sand
D)cavernous limestone

Question

Quizplus · Accepted Answer

Sand has small pores that allow for good filtration and effective removal of bacteria. Highly fractured granite and cavernous limestone may have too many large spaces for efficient filtration, while coarse gravel with few small grains may not provide enough surface area for bacteria removal.

Which One of the Following Aquifers Would Be Best for Purifying