Which state of iron, associated with meteorites or the core, is described as being strongly ferromagnetic?
Answer
Metallic iron
Planetary scientists differentiate iron states based on their magnetic behavior, which helps reconstruct internal history. Metallic iron, which is potentially still found within Mars's core or in meteorites that have impacted the planet, is defined as being strongly ferromagnetic, meaning it can be attracted by a magnet. In contrast, the oxidized forms, like magnetite ($ ext{Fe}_3 ext{O}_4$) which is highly magnetic, and hematite ($ ext{Fe}_2 ext{O}_3$) which is non-magnetic, represent different stages of chemical alteration away from this initial metallic state. The presence of metallic iron indicates the least oxidized form of iron.
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