Which one of the following logically explains why parts of some cavern systems are aerated?
A) The caves formed and later the water table rose.
B) A nearby, downcutting stream lowered the water table after the caves had formed.
C) Streams formerly flowing on the surface were diverted into the groundwater system through sinkholes.
D) The main water table is perched above the cavern roofs, allowing air to enter.
Correct Answer:
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