Astronomy current events question: volcanic interactions with Mar's oceans?

Astronomy 210L, spring semester 2018
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!)
Robert Sanders, "Mars' Oceans Formed Early, Possibly Aided by Massive Volcanic Eruptions" (March 20, 2018)
Researchers propose that Mars' oceans formed much earlier and shallower than previously thought, due to:
(A) volcanic activity.
(B) comet bombardment.
(C) global cooling.
(D) perchlorate rains.
(E) global sandstorms.

Correct answer: (A)

Student responses
Sections 30679, 30680
(A) : 29 students
(B) : 6 students
(C) : 2 students
(D) : 1 student
(E) : 1 student

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