Astronomy current events question: Chesapeake Bay asteroid impact crater

Astronomy 210L, fall semester 2019
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!)

Karen Valentine, "ASU Researchers Study Largest Impact Crater in the US, Buried for 35 Million Years" (August 8, 2019)
asunow.asu.edu/20190808-asu-researchers-study-largest-impact-crater-us-buried-35-million-years

Analysis of __________ from drilling samples provide evidence of the Chesapeake Bay asteroid impact 35 million years ago.
(A) water salinity.
(B) trapped gases.
(C) shocked crystals.
(D) extraterrestrial minerals.
(E) prehistoric mammal fossils.

Correct answer: (C)

Student responses
Sections 70178, 70186
(A) : 2 students
(B) : 2 students
(C) : 31 students
(D) : 3 students
(E) : 1 student