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Iron oxide is a major component of soils and can actually be good for the environment by being a good adsorber of essential metals for plant growth but also toxic metals and arsenic released from mining and industrial processes. However iron oxide suspended in solution can obscure light from aquatic ecosystems, reducing productivity and cause fouling of the gills on fish. Also iron oxides can act as transport agents by adsorbing harmful metals in one place only to release them into another.

Like most things in life not a clear cut thing - it depends on the circumstances!

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Q: Why is iron oxide bad for the environment?
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