Astronomy current events quiz: origin of Earths' water

Astronomy 210L, fall semester 2014
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!)

Daniel Clery, "Half of Earth's Water Formed Before the Sun Was Born," (September 25, 2014)
http://news.sciencemag.org/earth/2014/09/half-earths-water-formed-sun-was-born

University of Michigan, Ann Arbor researchers propose that half of Earth's water formed before the sun was born, based on measurements of different types of:
(A) exoplanets with water vapor clouds.
(B) gases trapped in Antarctic ice.
(C) comets from the edge of the solar system.
(D) hydrogen created in the big bang.
(E) fresh and salt water lakes.

Correct answer: (D)

Student responses
Sections 70178, 70186
(A) : 13 students
(B) : 9 students
(C) : 3 students
(D) : 11 students
(E) : 0 students