Gas–solid reactions on solar system bodies occur in the vicinity of their surfaces and in their interiors where gases are liberated through magma degassing or thermal devolatilization. The reactions are driven by chemical disequilibria created by exogenic (erosion, impacts) and endogenic processes (tectonics, magmatism) that change the composition of gas–solid systems and/or alter temperature and pressure conditions. Typically, the disequilibria are caused by a supply of fresh rocks to a body’s surface, degassing into an atmosphere, transport of gases through rocks, and gas–solid mixing in volcanic and impact environments. On bodies with atmospheres (Venus, Earth, Mars and Titan), gas–solid reactions...

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