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Verbal·Information and Ideas·Command of Evidence
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Days per Winter That Lakes Have Surface Ice
LakeLatitude (degrees)1980–811985–861990–911995–962000–012005–06
Lake Kegonsa42.9794116104113124101
Näckten62.913177168144174133134
Lake Baikal51.859611892103127109
It is common for freshwater lakes near or above a latitude of 45° north of the equator, like Bosten Lake in China, to accumulate surface ice in winter. The amount and duration of ice depends on many factors, including local weather conditions as well as the lake’s depth, volume, and surface area, but a climate researcher claims that some lakes in these latitudes have seen a decline in the duration of ice between the early 1980s and the mid-2000s.
Which choice best describes data in the table that support the researcher’s claim?
A
Lake Baikal had more days of ice in the winter of 2005-06 than it did in the winter of 1980-81.
B
Näckten had fewer days of ice in the winter of 2005-06 than it did in the winter of 1980-81.
C
Näckten is at a higher latitude than Lake Kegonsa and typically had more days of ice per winter than Lake Kegonsa did.
D
Näckten is at a higher latitude than Lake Kegonsa and typically had fewer days of ice per winter than Lake Kegonsa did.