Question

The picture shows a type of rock called a banded iron formation. The rock contains high levels of iron oxides minerals, which form only when iron at Earth's surface combines with oxygen. Approximately how old would Earth's oldest banded iron formations be?


André Karwath/Wikimedia

3 billion years old
4.6 billion years old
5 billion years old
65 million years old

Answer 1

https://lancastercity.owschools.com/media/o_envsci_2015/1/black-band_ironstone.jpg (ignore the Andre Karwath thing please .-.)

Answer 2

@Nnesha

Answer 3

@Donblue