Astronomy current events question: end date of Mercury's volcanic activity

Astronomy 210L, fall semester 2016
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!)
Tracey Peake, "Most Volcanic Activity on Mercury Stopped About 3.5 Billion Years Ago" (August 5, 2016)
According to North Carolina State University researchers, volcanic activity on Mercury ended about 3.5 billion years ago, as found from dating volcanic deposits using __________ data.
(A) surface hardness.
(B) reflectivity.
(C) chemical analysis.
(D) radioactive decay.
(E) crater size and number.

Correct answer: (E)

Student responses
Sections 70178, 70186
(A) : 2 students
(B) : 5 students
(C) : 3 students
(D) : 8 students
(E) : 16 students

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