Astronomy current events question: metal ions in Mars' upper atmosphere

Astronomy 210L, spring semester 2017
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!)
Bill Steigerwald and Nancy Jones, "NASA's MAVEN Reveals Mars Has Metal in its Atmosphere" (April 10, 2017)
Metal ions detected by NASA's MAVEN spacecraft detected in Mars' upper atmosphere may have come from:
(A) tiny meteoroids.
(B) its past volcanoes.
(C) the solar wind.
(D) the greenhouse effect.
(E) seasonal sandstorms.

Correct answer: (A)

Student responses
Sections 30679, 30680
(A) : 14 students
(B) : 6 students
(C) : 3 students
(D) : 0 students
(E) : 4 students

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