Astronomy current events question: Mercury surface composition

Astronomy 210L, fall 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, "Mercury Shows Its True Colors," October 3, 2011
NASA's Messenger spacecraft has measured the amounts of radioactive potassium, thorium, and uranium in Mercury's crust by __________ from orbit.
(A) detecting gamma rays.
(B) analyzing Mercury's ring particles.
(C) transmitting/receiving radar pulses.
(D) comparing reflectivity of different regions.
(E) recording infrared thermal emissions.

Correct answer: (A)

Student responses
Sections 70178, 70186, 70200
(A) : 19 students
(B) : 3 students
(C) : 2 students
(D) : 0 students
(E) : 7 students

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