Astronomy current events question: primitive achondrite meteorite flux

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!)

(Unattributed), "Today’s Rare Meteorites Were Once Common" (January 23, 2017)
fieldmuseum.org/science/blog/todays-rare-meteorites-were-once-common

Researchers determined that meteorites falling to Earth today are different than those that fell 467 million years ago, by studying samples from:
(A) Mars' surface.
(B) fossilized amber.
(C) an exposed ancient seafloor.
(D) extinct volcanoes.
(E) dinosaur bone marrow.

Correct answer: (C)

Student responses
Sections 30679, 30680
(A) : 11 students
(B) : 4 students
(C) : 16 students
(D) : 0 students
(E) : 0 students