PrepTest 158, Section 1, Question 4
A major problem facing industrial societies is their(443 more words not shown)
According to the passage, which(9 more words not shown)
- AIt can be(17 more words not shown)
- BIt can seldom(17 more words not shown)
- CIt can seldom(10 more words not shown)
- DIt can contain(13 more words not shown)
- EIt can move(12 more words not shown)
Reading the passage
Keep the description of underground water straight: some of it contains salt, some supplies drinking-water aquifers, and its movement isn't governed entirely by gravity. This question asks for a supported feature of the water. A familiar detail won't be enough if an answer attaches the wrong cause to it.
Working the answers
- A
The author never identifies a level of injected waste that would be acceptable in public drinking water. We can't turn the warning about contamination into permission for small amounts of it.
- B
Nothing tells us that water is seldom found above 200 meters. The accident example mentions waste escaping at 200 meters, but that isn't a survey of where underground water can be found.
- C
We don't learn whether this water is suitable for industrial processes. Industrial disposal of waste and industrial use of water are different topics.
- D
The salt is real; the proposed cause isn't. The receiving rock layers are “already saturated with salt water” before the waste is injected. The author doesn't attribute their salt concentration to contamination by the waste.
- ECorrect
The water moves along “subterranean pressure gradients” and can pass through faults, porous rock, and other formations. Pressure differences therefore provide an influence other than gravity that can move water between underground formations.
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