PT158 S1 P1 Q4 ExplanationDeep Well Injection

Answer choices, explained

1. A

   Opposite, if anything1% picked this

   It can be suitable as a source of public drinking water even when contaminated by low

   Nothing in our Support Window about underground water says anything about whether it is suitable as a source of drinking water, but the gist of the passage suggests the opposite. Our author is alarmed by the possibility of waste contaminating the aquifers from which humans get their drinking water.

   1%
2. B

   Waste, not Water4% picked this

   It can seldom be found at depths of less than 200 meters in regions in which

   The waste is usually not going to be found less than 200 meters from surface, because those wells are usually drilled at least 300 meters deep. We don't know how high underground water goes. We're told of an incident in the 2nd paragraph involving a well leak at 200 feet that threatened local water, but this answer is saying that underground water usually doesn't rise above 200 m and we have no support for that. We definitely don't have any facts about minimum depth of water in our Support Window for underground water.

   4%
3. C

   Outside the Support Window1% picked this

   It can seldom be used as a source of water for

   There's nothing in the two sentences we have available about underground water to talk about whether underground water is seldomly or commonly used as a source of water for industrial processes.

   1%
4. D

   Unsupported Causal Relationship7% picked this

   It can contain a high concentration of salt as a result of contamination

   The only mention of salt we're given is at the beginning of the 2nd paragraph (far from our Support Window), and it's just saying that waste is often injected into rocks that are saturated with salt water. It speaks about injection wells possibly leaking "significant amounts of noxious chemicals" into drinking water underground, but it never talks about wastes from the well causing the underground water to have lots of salt in it.

   7%
5. E

   Correct86% picked this

   It can move from one underground formation to another due to factors

   Why this is right

   This answer can be derived from our Support Window, the two sentences the passage gave us about underground water. We were told in the middle of the 3rd paragraph that the water in underground rock strata does not flow entirely under the influence of gravity. We can restate that claim by saying, "At least one other thing besides gravity is partially influencing the flow of underground water". And that's what this answer choice is saying. The rephrasing is difficult. The part of the process we need to make easy is locking in "underground water" from the question stem with the one sentence in the passage that says the words "water" and "underground". If we're anchored to this sentence as the most likely support for the correct answer, then it will be easier to fight for the legitimacy of this weird sounding answer. How do we know that it's moving from one formation to another? The following sentence, the last one in the 3rd paragraph, says "[underground water] can flow in any direction and, in some cases, can be transported thousands of meters through faults, porous rock, or other geologic formations.

   Skill tested: Locate Detail · how this choice captures the passage's function is the move to repeat next time.

   86%