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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.
Wiki User
∙ 6y ago
Wiki User
∙ 14y agoWithout oxygen, human beings can't exist. Because if there wasn't any oxygen humans would suffer great damges in their body.
Wiki User
∙ 16y agoOxygen in our atmosphere comes mainly from plants and the process of photosynthesis.
Wiki User
∙ 14y agoEarth has oxygen because we have trees.
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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.
Why do you need plants to live?
They give you oxygen. If ther was no plant life on Earth then no one would be alive...
What was not in the air on earth 3.6 billion years ago?
Oxygen was not present in large amounts in the early atmosphere of Earth.
Why do you not need spacesuits in earth?
Because a space suit is used to provide the human body with earth-like conditions inside the suit. Earth already has earth-like conditions, therefore we do not need suits to be on the earth. On earth, we already have an atmosphere and the proper pressure and temperature to keep the atmospheric gasses dissolved in our blood and going to our tissues.There are places on earth when we do need a 'suit' to stay alive. Places where the temperature, atmosphere and/or pressure are not adequate to keep us functioning properly require us to wear suits. Under water would be one place. There, we need a suit to keep us warm, and a mask to keep us breathing. Another place that I can think of is on top of a high mountain. Up there, the pressure is reduced enough that we have a difficult time getting enough oxygen to dissolve into our blood. So we increase our lungs' exposure to oxygen by wearing an oxygen mask.
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
Why does a space shuttle need a tank of oxygen?
because there is no, repeat NO oxygen in outer space. since oxygen is the gas we live on, we need it to keep our heart pumping. And since there's no oxygen in space, therefore you need a supply of oxygen brought from earth.
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 planet earth need plants?
Planet earth doesn't "need" anything, nor does life on the planet. Some bacteria can exist by chemicals. HOwever for our existence and through others species existence plants takes away CO2 in the atmosphere and also replenishes it with oxygen. We need oxygen to breath. All animals need 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.
What gas must animals breathe to live?
Oxygen. of course!! All living beings need oxygen to live on earth.
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.
Why do you need oxygen in space to make fire?
Fire needs oxygen no matter where it is. It is a chemical reaction between oxygen and some flammable substance. On Earth, the air is already 21% oxygen, so you only need to supply the fuel. In space there is no air and thus no oxygen, so you need to bring oxygen or some comparable oxidizer with you.
