Giant volcanoes formed the Great Lakes in prehistoric times.
Not quite, but that’s what seven percent of U.S. 12th-grade students guessed on geography tests last year.
More than half of students got it right: The Great Lakes formed when large volumes of freshwater melted from ice sheets and settled into depressed land.
A recent segment of Yahoo! Who Knew? highlights a low level of geography knowledge among American students – only 20 percent scored proficient or better on tests in 2010.
The U.S. team also lost to Russia, Canada and Taiwan at the World Geography Championship in San Francisco last month.
Do you know more Great Lakes geography than a 12th-grader? Test your knowledge here.