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There was so much oxygen 2.2 billion years ago such that it cannot be computed. In the present day, most of the oxygen has been reduced to metal oxides.

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3y ago

how much oxygen was in the Precambrian time?

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Q: How much oxygen was there 2.2 billion years ago?
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Related questions

Is the current oxygen content of the atmosphere lower or higher or about the same as is was millions of years ago?

About the same. About a half billion years ago it was significantly higher, and more than a billion years ago it was lower, much lower. Before 1.5 or 2 billion years ago there was no free oxygen in the atmosphere, before 3 billion years ago there wasn't any.


What gas was enriched about 2.5 billion years ago?

oxygen


Was Oxygen present in Earth's second atmosphere over 4.5 billion years ago?

The Carboniferous period, during which oxygen amounted to 35% of the atmosphere by volume (this was around 300 million years ago). Nowadays the amount is 20.95%.


When did oxygen enter the atmosphere?

2.4 billion year ago :D


What element transformed carbon dioxide atmosphere a billion years ago to what you breathe?

Oxygen is the element that transformed Carbon Dioxide atmosphere a billion years ago to what you breathe.


How many years ago did large amounts of oxygen gas first appear on Earth's atmosphere?

After plants developed chlorophyll and multiplied to the point where they could "pollute" the primal atmosphere, somewhere between 1 and 2 billion years ago.


How did earth get oxygen 4 billion years ago?

From primitive bacteria that produced oxygen as a waste product.


What began producing oxygen more than 2 billion years ago?

the earth


What has been producing oxygen more than 2 billion years ago?

accumulate


What was missing from the atmosphere over 3 billion years ago?

Oxygen, for one thing.


How did earth come to have an oxygen rich atmosphere?

Algae activity


More than 2 billion years ago blank began producing oxygen?

More than 2 billion years ago, trees and plants began producing oxygen. They do this by feeding off carbon dioxide released by living beings.