Why is atmospheric oxidation slower on Earth compared to Mars regarding surface iron exposure?
Answer
Earth's strong magnetic field and thick ozone layer shield iron from intense radiation
The difference in oxidation rates between Earth and Mars is strongly tied to planetary protection mechanisms. Earth benefits from a robust, strong global magnetic field and a thick ozone layer, both of which act as significant shields. These layers protect surface iron from harsh solar and cosmic radiation that drives chemical breakdown. In contrast, Mars lacks this comprehensive shielding, leaving surface iron directly exposed to intense radiation, which accelerates the photochemical reactions necessary to drive atmospheric oxidation, even if these reactions proceed slowly over vast geological timescales.
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