Under what conditions does Hexavalent CrOx form on NiChrome?

Compare/contrast the gases in the atmosphere during the Silurian with the conditions under which iron ore form?

  • We acknowledge that vast iron ore deposits were created during the Precambrian [the Superior-type]. In the Silurian [mid-Paleozoic] iron ore deposits known as "oolitic hematite" were formed [they are today present from Alabama in the south, in WV and even in Wisconsin]. Compare and contrast the gases in the atmosphere during the Silurian with the conditions under which the Superior type iron ore was formed.

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