Question

A molecule of carbon moves through various media during the process of its cycling. In which medium will it move the fastest?
A.
soil
B.
air
C.
biota
D.
runoff water
E.
oceanic water

Answer 1

The answer is; B

The carbon cycle exists in the atmosphere mainly as carbon dioxide. The levels of carbon dioxide change can change dramatically over years.  The movement in and out of carbon in the atmosphere  is fast and influences by factors such as combustion and photosynthesis. The former increases carbon in the atmosphere whole the latter decreases it.