ConcepTest: Oldest Rocks
and is replicated here as part of the SERC Pedagogic Service.
The correct response is C.
Percentage of students choosing this answer. (% Before Discussion/% After Discussion):
b. D (13%/0%)
c. E (40%/73%)
e. G (20%/7%)
in a small (< 60 students) environmental geology class
If you would like to help acquire more Before and After statistics for this example, please contact the authors (see link at top of page).