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The oxygen in the air of earth is the result of biological processes over the past 4000 million years.
Trees give out oxygen as they photosynthesize
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Initially Earth's atmosphere did not contain free Oxygen (we know this from the chemistry of sediments that were first formed). Life on earth then happened and by the process of photosynthesis slowly began releasing Oxygen into the environment. At first this Oxygen reacted chemically with stuff (eg Iron salts) in the environment but over time all this "stuff" was converted and free Oxygen began to appear in the environment. This speeded up the development of life and about 600 million years ago there was enough Oxygen for life to use it to build calcareous shells and eventually for life to move onto the land. Thus life has made the planet we have today, Earth has been "terraformed" and now has an Oxygen rich atmosphere.
What else can I help you with?
Do volcanoes have oxygen?
No. A volcano erupts molten material from inside the earth. Actual fire is not involved:the material is hot to begin with and has been since the formation of the earth.
On earth oxygen usually exist as what?
Oxygen usually exists as a diatomic molecule, O2, in the Earth's atmosphere.
Why are oxygen and hydrogen so common in animals and on earth.?
For one, oxygen and hydrogen mostly make up organic compounds (the one element you need for an organic compound NO MATTER WHAT, would be carbon). Organic compounds make up every living thing on earth, from tigers to cyanobacteria to mushrooms. That's why H and O are so common in animals. Now for the earth. Hydrogen is the most abundant element in the universe, for one. We also need oxygen to breathe and live. Cyanobacteria were the first organisms to produce oxygen, little interesting fact there. Hope this helps!
The most abundant gases are nitrogen and?
The most abundant gases are nitrogen and oxygen in the Earth atmosphere.
What element has the greatest abundance in the Earth's crust?
Oxygen is the most common and abundant element in the Earth's crust having 47% of the mass.
Why do you need to live on earth?
oxygen
How does a animal gather oxygen on land?
Oxygen is everwhere. On earth, in the air, and on land. The animal does not need to gather oxygen.
Does Jupiter have earth's oxygen so people don't need to use a oxygen tank and mask?
no
Where does oxygen exists natrually on earth?
i need help on this2
Is oxygen manmade?
No. Earth's oxygen is provided by plants. Humans need oxygen to live, so we could not have been there before there was oxygen, so we could not have made the oxygen.
Why does a human need earth?
it is the only planet that has oxygen, water and good temperature.
Why do you live in earth and not space?
because people need oxygen to breath, in space there is no oxygen making people ineligible to breath.
How much oxygen does a fire need to ignite?
Fires require oxygen to ignite and sustain combustion. In general, fires need around 16% to 17% of oxygen in the air to burn. This oxygen level is typically found in the Earth's atmosphere.
Effects of no oxygen on earth?
Oxygen is main gas of earth. If there is no oxygen in the earth all the life in the earth should die.
What is the specific name of the one organism on earth that does not use oxygen it its respiratory system?
There exist several life forms which do not need oxygen for survival, for example bacteria purple sulfur bacteria (Chromatiales). But if I recall correctly, no higher life forms which don't need oxygen exist on Earth.
Is there a life that doesn't need oxygen?
Yes. There are organisms called anaerobic bacteria which do not need oxygen. To some organisms, called obligate anaerobes, oxygen is actually toxic. The first living things on Earth were obligate anaerobes.
Does most life on earth need oxygen or is Most not need it?
all animals need oxygen no matter whether they get it from the water or air or through their skin. plants don't need oxygen that i know of they convert carbon dioxide to oxygen truthfully I'm not sure about bacteria, viruses, protisits, etc (microscopic life) but I'm pretty sure they get energy from oxygen.
