Question

The presence of iron oxides in rocks, formed during a specific time period, can be used as evidence of oxygen in the atmosphere during that time period.

Question 18 options:
True
False

Answer 1

the answer is TRUE i took the test

Step-by-step explanation:

Answer 2

True

Step-by-step explanation:

Iron oxides can only form naturally in the presence of oxygen as shown the formulae below:

2Fe(II) + O2 → 2FeO

4Fe(III) + 3O2 → 2Fe2O3

The presence of naturally occurring iron oxides can, therefore, be a significant indicator of the presence of oxygen in the atmosphere.