LSAT 146 | Section 4 | Reading Comprehension: Q26

RC Question 26 Explanation

DISCUSSION: From what we know, chlorine was the most damaging part of CFCs. So, to figure out if a chemical would be safe, we should see whether it contains chlorine, or whether it would act like chlorine.

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1. Ozone is the only part that matters. Why not test for that? Other forms of oxygen wouldn’t necessarily tell us much.
2. We don’t care about the lower atmosphere. The ozone layer is in the stratosphere (upper atmosphere).
3. This mixes two terms. We don’t care whether something reacts with chlorine. We care whether it reacts with ozone, in the same way that chlorine does.
4. CORRECT. This is important. If the new chemical also destroyed ozone like chlorine does, then that would be bad.
5. This sounds like chlorine, but it’s not the real problem. Lots of things might break down under UV exposure. But the key question is whether those things destroy ozone.