Missing Mars CO2 (IMAGE)
Caption
This schematic illustrates the progressive alteration of iron-rich rocks on Mars as the rocks interact with water containing CO2 from the atmosphere. Over several billion years, this process could have stored enough CO2 in the clay surface, in the form of methane, to explain most of the CO2 that went missing from the planet’s early atmosphere.
Credit
Courtesy of Joshua Murray, Oliver Jagoutz, et al
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