The methane content of Mars's atmosphere is not constant but variable. All of the following processes could be responsible EXCEPT one. Which does NOT produce methane?
A)volcanic activity
B)dust devils
C)microbes
D)small meteorites exposed to ultraviolet radiation

Question

Quizplus · Accepted Answer

Dust devils are strong wind vortexes that can pick up and transport dust and small particles on the surface of Mars, but they do not produce methane. The other three processes have been suggested as possible sources of methane on Mars. Volcanic activity could release methane trapped in the subsurface, microbes could produce methane as a byproduct of their metabolism, and small meteorites exposed to ultraviolet radiation could generate methane through interactions with water and other compounds on the Martian surface.

The Methane Content of Mars's Atmosphere Is Not Constant but Variable