Astronomy current events question: neighborhood micrometeorite collection

Astronomy 210L, spring 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!)

Jennifer Hackett, "How to Find Tiny Meteorites at Home" (April 1, 2016)
scientificamerican.com/article/how-to-find-tiny-meteorites-at-home/

Micrometeorites can be extracted at home using a magnet on material collected from:
(A) tap water.
(B) composted plant material.
(C) rain gutter downspouts.
(D) volcanic ash.
(E) ocean floor sediments.

Correct answer: (C)

Student responses
Sections 30678, 30679, 30680
(A) : 7 students
(B) : 3 students
(C) : 21 students
(D) : 3 students
(E) : 5 students