Question

How were the iron beds in the oceans formed? im giving 100 points here are your anwser

1 Underwater volcanoes erupted, and the lava turned into iron.
2 Hydrogen and iron in the oceans reacted and formed the iron beds.
3 Oxygen and iron in the oceans reacted and formed the iron beds.
4 After billions of years, cyanobacteria turns into iron; the iron beds are remnants from cyanobacteria. its 7th grade science

Answer 1

Its number 4 , After billions of years, cyanobacteria turns into iron; the iron beds are remnants from cyanobacteria. its 7th grade science.

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