Question

how does iron formed​

Answer 1

ANSWER

• Nearly all of Earth's major iron ore deposits are in rocks that formed over 1.8 billion years ago.
• At that time Earth's oceans contained abundant dissolved iron and almost no dissolved oxygen.
• The iron ore deposits began forming when the first organisms capable of photosynthesis began releasing oxygen into the waters.

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Answer 2

Answer:

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Explanation:

Iron formed from chemical reactions that combined iron and oxygen in marine and fresh waters. The two most important minerals in these deposits are iron oxides: hematite (Fe2O3) and magnetite (Fe3O4).

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