Astronomy current events question: lunar swirls

Astronomy 210L, Spring Semester 2011
Cuesta College, San Luis Obispo, CA

Students are assigned to read online articles on current astronomy events, and take a short current events quiz during the first 10 minutes of lab. (This motivates students to show up promptly to lab, as the time cut-off for the quiz is strictly enforced!)

Kelly Beatty, "New Insights on Lunar Swirls," March 24, 2011
http://www.skyandtelescope.com/news/home/118592329.html

Observations of __________ on the moon may provide evidence that lunar swirls are created by rising and settling dust.
(A) crater density.
(B) shadowed pole craters.
(C) light along the horizon after sunset.
(D) fresh comet impacts.
(E) shifting sand dunes.

Correct answer: (C)

Student responses
Sections 30678, 30679, 30680
(A) : 9 students
(B) : 4 students
(C) : 14 students
(D) : 9 students
(E) : 17 students