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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.
What else can I help you with?
What is inferred to be the main source of the free oxygen that first entered earth?
oxygen producing organisms
How do you know that the first living thing did not require oxygen?
Scientists infer this by studying the evolution of life on Earth. The first living organisms likely evolved in an anaerobic (oxygen-free) environment, as oxygen levels were not initially present in significant amounts on Earth. These organisms would have been adapted to survive in environments without oxygen, and the need for oxygen likely evolved later as more complex organisms developed.
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!
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.
What is meant by the term 'free oxygen'?
"Free oxygen" refers to oxygen that is not bound to other elements or molecules. It typically refers to molecular oxygen (O2) that is available in the atmosphere for respiration by living organisms.
The primitive earth's atomsphere did not contain?
Free oxygen
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 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.
What is free oxygen?
Free oxygen refers to oxygen that is not combined with other elements. It is a diatomic molecule with the chemical formula O2 and is essential for respiration in many organisms. Free oxygen is found in the Earth's atmosphere, where it makes up about 21% of the air we breathe.
Where does the free oxygen in Earths atmosphere come from?
The free oxygen in Earth's atmosphere primarily comes from the process of photosynthesis carried out by plants, algae, and certain bacteria. During photosynthesis, these organisms use energy from sunlight to convert carbon dioxide and water into oxygen and glucose.Approximately half of Earth's oxygen is produced by marine plants, specifically phytoplankton.
Can minerals tell you if earth's early atmosphere had little on no free oxygen?
True
What is the importance of the formation of free oxygen?
free oxygen is basically an oxygen-free-radical oxygen breaks into free oxygen under the action of sunlight (ultraviolet rays) these free oxygen are highly reactive and combine with oxygen molecule to give ozone and ozone helps filter the harmful effects of ultraviolet rays also the ozone layer is the basic reason for human survival on earth as the sun is too damaging, that i would have burnt us alive into tandoori human!!!! LOL
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 is the only planet known to have a significant amount of oxygen in its atmosphere. Other planets within our solar system either have trace amounts of oxygen or it is mainly bound up in compounds like water or carbon dioxide.
The primitive earth's atmosphere did not contain?
Oxygen. The early Earth's atmosphere was composed primarily of gases such as carbon dioxide, water vapor, nitrogen, and methane. Oxygen levels increased with the development of photosynthetic organisms.
