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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
Spirit Lake43.46102135121134147126
Lake Kegonsa42.9794116104113124101
Näckten62.913177168144174133134
It is common for freshwater lakes near or above a latitude of north of the equator, like Lake Stechlin in Germany, to accumulate surface ice in winter. A study from 1980 to 2006 showed that, in general, the number of days per winter that such lakes have measurable amounts of surface ice is declining. However, a researcher claimed that some lakes have instead seen an increase in the duration of ice.
Which choice best describes data in the table that support the researcher’s claim?
A
Spirit Lake had fewer days of ice in the winter of 1980-81 than it did in the winter of 2005-06.
B
Näckten had more days of ice in the winter of 1980-81 than it did in the winter of 2005-06.
C
Näckten is at a higher latitude than Lake Kegonsa and typically had fewer days of ice per winter than Lake Kegonsa did.
D
Näckten is at a higher latitude than Lake Kegonsa and typically had more days of ice per winter than Lake Kegonsa did.