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This successful harmony resulted in a large number of photosynthesising cells that take water (H2O - dihydrogen oxide) and used sunlight as the power source to extract the hydrogen for food and release the oxygen. The released oxygen found it's way into the atmosphere. This is the exact chemical reaction that continues today in all plants and algae.
Ok, for those on Study Island the answer is the free oxygen bubbled up from the oceans.
Vincent Hilpert
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What is inferred to be the main source of the free oxygen that first entered earth?
oxygen producing organisms
Was the atmosphere of the earth always mostly nitrogen and oxygen?
No, the Nitrogen in the air has probably always been there (because nitrogen is rather inert), but originally Earths atmosphere was reducing (it had no free Oxygen) and probably contained large amounts of CO2 and hydrocarbons. The present atmosphere on Earth is the product of biological processes which have slowly introduced free Oxygen into the Oceans and then the atmosphere - life made Earth habitable for life!
Why does oxygen occur naturally?
It is a byproduct of the life processes on Earth. Earth's early atmosphere contained no Oxygen, but Earth was slowly Terra-formed by life and obtained an Oxygen rich atmosphere.
Where is oxygen found and how is it obtained?
Oxygen is found as a free molecule in the air and as a component of many organic and inorganic compounds in the earth's crust. For commercial purposes, it is usually obtained by using extreme cold to condense it from the atmosphere.
Does Luna have oxygen on it?
Probably not free gaseous oxygen, such as the Earth has and that we breathe. However, astronomers have determined that there is water ice - perhaps a LOT of it - in the deep craters near the south pole of the Moon. And water is H2O - two hydrogen atoms combined with one oxygen atom. So, yes, there is oxygen on the Moon.
The primitive earth's atmosphere did not contain water vapor free nitrogen free hydrogen free oxygen inert gases?
free oxygen
The primitive earth's atmosphere did not contain?
free oxygen
The primitive earth's atomsphere did not contain?
Free oxygen
What is inferred to be the main source of the free oxygen that first entered earth?
oxygen producing organisms
What planet has plenty of oxygen?
Earth has oxygen. But I don't know why you have to call it "free oxygen". It's not really "for free". People have to plant trees in order to receive oxygen. They are the ones that are supposed to be responsible for their lives. Earth supports the humans by giving them a place to plant, that's why it is the only "living planet".
Why does Earth only have oxygen?
It doesn't; Earth has many other gasses. Our atmosphere is mostly nitrogen; only about 21% is oxygen. It may be that you intended to ask, why does only Earth have free oxygen in its atmosphere, while other planets in the solar system don't. Free oxygen is produced by green plants (by a process called photosynthesis) and green plants grow only on Earth.
What is inferred to be the main source of the free oxygen that first entered earth's atmosphere?
oxygen producing organisms
What is hypothesized to be the early source of free oxygen in Earth's atmosphere?
cyanobacteria
Why was oxygen absent from earth's early atmosphere?
Oxygen is an extremely chemically active element, which is why things can burn in our current atmosphere. In the early Earth, all the oxygen had reacted with other chemicals in the environment, so that there was no free oxygen. Only later, when photosynthesis was used by green plants, was there a source of free oxygen.
What is the method of mining oxygen?
Oxygen is not mined on the planet Earth. It is a free gas in the air. Various minerals ARE mined that contain oxygen.
Can minerals tell you if earth's early atmosphere had little on no free oxygen?
True
Hypothesized to be the early source of free oxygen in Earth's atmosphere?
photosynthesis by cyanobacteria
