PrepTest 146, Section 4, Question 23
By 1970 it was well established that ultraviolet(442 more words not shown)
The information in the passage(10 more words not shown)
- AWhat laboratory experiments(11 more words not shown)
- BWhat was the(9 more words not shown)
- CIn what year(7 more words not shown)
- DDoes any chemical(12 more words not shown)
- EWhich constituent element(7 more words not shown)
Reading the passage
We need a question we can actually answer from what we read. We know how CFCs damage ozone: they move upward, break apart, and release chlorine. We also know about the scientists’ advocacy and the resulting policy changes. But knowing the broad story does not supply every experimental detail or date.
Working the answers
- A
We learn what Molina and Rowland studied and what they found, but not which laboratory experiments they conducted. The chemical explanation does not give us their experimental procedures.
- B
The buildup estimate is from 1974. The 1987 date identifies the Montreal Protocol; it does not come with an estimate of atmospheric CFC concentration that year.
- C
Molina testified before Congress, but no year is given for that testimony.
- D
Chlorine destroys ozone, but we are not told whether chemicals containing no chlorine also contribute to ozone destruction. Identifying one source of harm does not give us a complete list.
- ECorrect
Chlorine. The second paragraph singles out the increased chlorine concentration as “devastating to the ozone layer” and explains its repeated destruction of ozone molecules. We have an answer to this question right in the chemical explanation.
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