that occur between the gases and the local environment. The highest concentrations in magmatic gases are water vapor
(H2O),
carbon dioxide (CO2), sulfur dioxide (SO2),
hydrogen (H2),
carbon monoxide (CO), and hydrogen sulfide (H2S).
Other minor gases include sulfur (S2), carbonyl sulfide (OCS), methane
(CH4), hydrogen chloride (HCl), hydrogen fluoride (HF), and hydrogen
bromide (HBr). Many other
/volcanoes/volcanic-hazards/volcanic-gases/