Biotic processes that contribute to atmospheric methane fluctuations can exist in permafrost.
Only abiotic processes at the poles contribute to atmospheric methane fluctuations.
Methane fluctuations could potentially result from biotic processes in Martian desert regolith.
Methane can result from light-metal oxidation interactions at the surface level of Mars.
Simulated Martian soil has the potential to sustain methanogenic bacteria, given the right environmental conditions.
Abiotic processes exist but cannot explain the magnitude of methane fluctuations on Mars.
Methanogenic processes have the potential to exist beneath the Martian surface because possible abiotic sub-surface processes cannot account for methane fluctuations seen.
Abiotic sub-surface processes, such as hydrothermal venting, have the capability to produce methane and cause fluctuations at the magnitude seen in data.
Liquid-rock interaction could exist at the sub-surface level of Mars and can create methane.