Question

There was no free oxygen in the early atmosphere because most of it was tied up in
A. water, B.ammonia, C.methane , D.rock​

Answer 1

Most of the available Oxygen was trapped in the iron-rich rocks in the early atmosphere

Explanation:

During the initial stage of earth, after its formation, the amount of oxygen was relatively very low and was produced by the cyanobacteria and stromatolites. This oxygen was mostly present in the ocean water in the dissolved state. The ocean was initially comprised of a large amount of iron, where this dissolved iron has the capability to store dissolved oxygen as they come in contact with each other. It then becomes iron oxides and creates extensively large deposits which are commonly known as the Banded Iron Formation (BIF). This storing of oxygen has taken place both before and after the occurrence of the Great Oxygenation Event (GOE).

This is how the free oxygen available in the initial atmosphere was trapped in the iron-rich rocks known as the BIF.

Thus, the correct answer is option (D)- Rocks.

Learn more about earth's initial atmosphere

Primitive earth's atmosphere https://brainly.in/question/6132621

Answer 2

Answer:

D.rock​

Explanation:

There was no free oxygen in the early atmosphere because most of it was tied up in Rock.

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