c5bad647_Methane_Catastrophe__Gas
[Symbol] H¸2S [Significance] A highly toxic gas, known by its rotten egg smell. Produced by sulfate-reducing organisms in anoxic marine conditions, it readily combines with iron in the blood of aerobic organisms, and, in sufficient quantities, kills them. [Gas] 
Hydrogen sulfide
O x y g e n
W a t e r v a p o r
C a r b o n d i o x i d e
M e t h a n e
H y d r o g e n s u l f i d e
H y d r o x y l
O z o n e
Methane Catastrophe
Gas